lexsync (development version)

• The package now declares Depends: R (>= 4.0.0). tools::R_user_dir does not exist before 4.0.0, and round()’s post-4.0 algorithm shapes artefact bytes, so an older R would fail obscurely or write different bytes without complaint.
• The published median goes through the exact reductions. describe_stimuli() was the one reduction still on stats::median, which averages the two middle values through mean()’s long-double accumulator while the Python engine reduced through numpy. Both engines now sort and take the exact middle, with (a + b) / 2 in plain double arithmetic for even n, and regenerating every design moved no byte. Reproducibility and parity claimed that every reduction shared one compensated-summation algorithm, which the median never did, and now describes the sort-and-middle rule beside it.
• The dead half of the two-shortest-forms CSV guard now fires. Between 2^49 and 1e15 two one-decimal strings can round-trip to the same double, and the R check derived its digit count from a 15-digit format that never shows a fractional digit there, so R accepted values (844424930131968.2 among them) that the Python writer refused. R now refuses exactly the same values, and the change only adds refusals.
• A condition without define_by selects identically in both engines. This engine always fell back to the whole pool. The Python engine crashed with a bare KeyError on the same design and now mirrors the fallback, pinned by twin tests.
• A pair design’s tolerance-window relaxation reaches the run log and datasheet. The continuous-pairs selector’s re-expansion dropped the audit in both engines, so a relaxed window left no trace outside the console. No shipped pair design relaxes, so no committed artefact changed.
• INTER_TRIGGER_S is substituted through %.17g like its neighbours in the generated PsychoPy script. It used as.character(), whose rendering of a non-integer quotient differs from Python’s str(). The shipped default still renders “0.01”, so no committed experiment byte moved.
• The counterbalancing hash keys convert to UTF-8 before hashing, as hash_unit() always has, so a latin1-marked condition read from a user’s CSV can no longer rank by different digests in the two engines.
• The command-line wrapper reports which copy of the package it loaded. R_workflow/run_pipeline.R prefers an installed lexsync over the edited sources, so edits silently did nothing until a reinstall. It now states the loaded copy and the remedy on stderr at startup.
• The Shiny app writes its design YAML with LF endings through a binary connection (the datasheet hashes that file into design_sha256, which must not depend on the operating system), and its parity caption now matches the keyed-hash guarantee: the engines produce byte-identical stimuli and trial order, where the caption used to promise only the stimuli. The Python engine’s twin fixes land in the same release: its writer refuses 16-digit integer columns as this engine always has, its scalar rounder passes an overflowing scale through, and run_pipeline(verbose = FALSE) keeps its console silent.
• A selection that cannot honour n_per_condition is now an error. Every selector used to clip the request to the available pool and said so at most through a verbose message, while the datasheet and the generated Methods text kept stating the requested n. The new matching: shortfall policy defaults to error, and allow accepts the shrink. Its sibling matching: on_insufficient_tolerance (default relax) can likewise turn the silent tolerance-window widening into a refusal, and a relaxation that does happen is now recorded in the run log and the datasheet (selection.window_relaxations), where before it was only narrated to the console. No committed design experiences either condition.
• joint and optimal matching can no longer select the same word twice. With overlapping condition windows a word could be paired with itself at zero cost, or mirrored across two sets, appearing in both conditions. Both matchers now track used words as the anchored matcher always has, and every matcher asserts its output holds each word at most once. Every committed design has disjoint conditions, and those select identically, byte for byte.
• The item-table loader refuses missing cells in both engines. A blank condition reached Python’s hash-key guard as the string “nan” and passed the very check built to refuse it, a blank item cell turned numeric identifiers into “1.0”, and R failed on the same table with a bare “missing value where TRUE/FALSE needed”. Missingness is now checked before any coercion, item is read as text, empties after trimming and duplicated item-and-condition rows are refused, and both engines say the same thing.
• Cohen’s d no longer reports perfect balance for two unequal constant vectors. The standardised difference is undefined when the pooled SD is zero and the means differ, so it is now reported as missing. The old 0 with CI [0, 0] contradicted the TOST verdict on the same row.
• The datasheet’s Methods prose follows the recorded verdicts. The claim of being “within the 0.5-SD equivalence bound” was printed for any controlled dimension with a confidence interval, even where the datasheet’s own JSON recorded equivalent: false. The sentence is now conditional on the stored verdicts, prints the signed worst difference and the configurable bound, and the analysis note names the suggested formula as lme4 syntax, where it used to imply that statsmodels accepts it. The datasheet also gains the SHA-256 of the design and schema, the pairwise matchers’ candidate cap and whether it fired, the equivalence bound tested against, and the yaml, stringi and operating-system entries the environment record omitted.
• A continuous block now works over a supplied pool, and two silent table-mode gaps are refusals. source: pool reaches the continuous selector (it previously fell through to the conditions matcher and crashed). A continuous table without members is an error now, as is pool_filters on a plain table design, where each used to do nothing silently while the provenance recorded otherwise. Misspelt pool_filters or define_by columns, duplicate condition names, reversed or non-finite ranges, negative tolerances and non-integer n are likewise refusals now.
• Selection-path rounding goes through the shared decimal rule (.round_dp and a new vectorised numpy twin), replacing a pairing of R’s round() with numpy’s, two rounders the project measured to disagree at boundaries. Regenerating all 21 designs moved no stimulus, report or experiment byte. A custom norm named in match_on now also reaches the descriptives, comparisons and realised-control record, which previously listed only the built-in dimensions.
• A design file could execute code on the machine that ran it. A design is meant to be shared, and the recipient runs it and then opens the generated PsychoPy script, OpenSesame experiment or jsPsych page. Stimulus text was always safe: it travels in the loop-table CSV the experiment reads at run time. Design metadata was not. The name, language label, font, parallel-port address and the column names on jitter and feedback events were substituted straight into code and markup positions, so a quote or an angle bracket there stopped being text and became syntax, and a crafted design could run arbitrary code on a lab machine or in the origin of a hosted browser study. Both engines now validate these values, under one rule that leaves every legitimate value byte-identical. A port address must be an address, a column name must be an identifier, and a stated language_tag is shape-checked before it is used. Escaping them correctly would have taken three rules per engine. .pyq() escapes newlines now as well: an .osexp is line-oriented, so a raw newline closed the inline-script block and let the rest of the value start a new top-level item. Pinned by test-injection.R. No generated artefact changed. Adversarially attacking that fix then found four ways through it, all now closed and pinned. The largest: a response event’s keys were joined into OpenSesame’s set allowed_responses "a;b" with no validation at all, and that is one line of a line-oriented format, so a key holding a double quote closed the string, a newline ended the line, and the rest of the value became new top-level items in the experiment, including an inline_script whose body OpenSesame runs. Keys are validated now. The shape guards were also anchored with $, which in both Python’s re and R’s PCRE matches just before a final newline, so a port address ending in one passed the check. They are anchored at end-of-string now. A scalar keys: space or blocks: practice was iterated character by character in Python and kept whole in R, so one design gave two different allowed-response lists and a block-restricted event ran everywhere in one engine and nowhere in the other. And R’s HTML escape did not cover U+2028/U+2029, which end a line in JavaScript but are not ASCII controls: Python escaped them, R did not, so the same design produced different bytes and R’s <script> was a syntax error before ES2019.
• A browser experiment could score a feedback screen against the previous trial’s keypress. The jsPsych feedback screen looked up “the last row marked scoreable”, which is that trial’s response only when the trial has one. An event may be restricted to a block, so a design running the response event in one block and feedback in another leaves a trial with no response row of its own, and the screen then reported a verdict computed from an earlier trial’s key. Each trial’s rows now carry its own identifier and the screen matches on it. The generated HTML changed for all 21 designs. No stimulus selection changed.
• A large number in a user’s own column was written differently by the two engines. write_csv_utf8() reproduced readr’s format for small magnitudes and left the top end alone, since nothing lexsync computes reaches it. Nothing lexsync computes does. A joined norm table, a supplied pool or an item table carries whatever columns the user has, and those go straight into the stimuli CSV, so the guarantee held for the shipped designs and failed silently for the user’s own data. readr’s layout above 1e15 could not be reproduced in Python, which writes 1.5e16 as 15e15, the largest double as 17976931348623157e292, and the double nearest 5e22 as 4.9999999999999996e+22. Both engines now refuse such a value and name the column. One engine accepting it would leave the two writing different bytes. A value with two equally short decimal forms is refused for the same reason. Everything verified to render identically, across 465 values compared against readr’s own output, writes as before.
• A generated OpenSesame experiment with a feedback event or a blocks: restriction would not run. The emitter wrote unicode(...), a Python 2 builtin that OpenSesame’s Python 3 inline workspace does not provide, so the experiment died with NameError on the first trial. It also passed None as a var.get() default, which OpenSesame cannot distinguish from no default, so it raises where it should return. Both are fixed, both spellings are now pinned by a test, and a feedback event with no preceding response or question is refused at generation time. Left to run time, that one design error would surface as three different failures, one per target.
• Reported statistics are rounded by an arithmetic definition both engines compute identically, because no pairing of built-ins agreed. Measured over 210,000 values, including every three-decimal halfway case in range, R’s round() disagrees with Python’s builtin, Python’s builtin disagrees with numpy’s, and even R’s sprintf("%.3f") disagrees with Python’s "%.3f" on 274 of them. Some values move by one in the last published digit. No selection changes.
• A hash-key component that cannot be rendered identically in both engines is now refused rather than hashed. A blank condition cell, a routine data error neither reader rejects, rendered "NA" in R and "nan" in Python, so the two engines produced different trial orders from the same design, reproducibly and with nothing to signal it. Booleans get a pinned spelling and are still accepted.
• The overlap-cap centroid in the joint and optimal matchers goes through the compensated reduction. The cap does fire on shipped designs, so it decides which candidates reach matching. It was verified to change no design’s selection.
• R CMD check --as-cran is clean: 0 errors, 0 warnings, 1 note (the standard new-submission note). Fixed on the way: three undocumented arguments on select_continuous_stimuli(), an unqualified utils::head(), and the package’s only example, which called an unexported function from inside \dontrun{} and so could never have worked if a user copied it. The package now has executable, offline examples, and cran-comments.md no longer misstates the check result.
• Three factual corrections. The SUBTLEX-PT registry entry cited a DOI that resolves to an unrelated psychometrics paper. The matching vignette put Zipf 7 at a thousand occurrences per million where the correct figure is ten thousand, contradicting its own lower anchor. A design comment attributed “840-prime materials” to Rastle et al. (2004), a figure that appears nowhere in that paper.
• A design may declare practice: and fillers: item tables. Those trials are presented but not analysed, so the stimuli file and the reports are written from the main rows while the generated experiments run every trial. Practice comes first. Fillers are interleaved with the main trials, because a block of fillers at the end is not a filler but a second block a participant can tell apart. A design declaring neither is unaffected, down to not gaining a block column.
• A feedback trial event, and a blocks: key that restricts any event to named blocks. Together these confine feedback to practice, which is the usual arrangement: feedback teaches the mapping, and would contaminate the reaction times it is measuring. Implemented for PsychoPy, OpenSesame and jsPsych alike. The PsychoPy runner now returns the pressed key so it can be scored, and each runner pauses at a block boundary.
• The Python engine embedded a bare NaN in the generated jsPsych experiment where a trial had no value for a field another block supplies (a main-block trial in a design whose practice items carry an answer). That is not valid JSON, and the R engine dropped the key instead, so the two engines’ experiments differed. Both now drop it.
• The generated artefacts were not byte-identical across the engines, and the parity test could not see it. It read both CSVs back with a parser and compared the values, under which 1 and 1.0 are the same number. Thirteen of the 18 shipped designs differed byte for byte while the gate stayed green. Three differences were serialisation (a whole number written 1 and 1.0, a boolean written FALSE and False, a small value written 9e-4 and 0.0009) and one was not: two reported means differed in the last decimal published, because numpy sums pairwise and R’s mean() does not. Every reduction in the package now uses one compensated-summation algorithm written out in both engines, whose agreement follows from IEEE-754 and no longer from measurement. The writers agree on every value, and the artefacts are now compared as bytes. No R golden moved, because R’s two-pass mean was already the correctly-rounded one.
• A response key coded f was silently turned into FALSE. readr reads a column whose values are all f, t, T or F as logical, while pandas keeps the string, so an item table using the commonest two-choice key pair had its correct answer corrupted in one engine. Item tables now read the condition label and the paradigm’s presented fields as text in both engines.
• jsonlite’s default of four digits was truncating the datasheet: a design declaring tolerance_k: 0.1111111111111111 had it recorded as 0.1111, which does not reproduce the run the record exists to describe. The JSON is now written at full display precision, and the Python engine writes the same precision.
• New paradigm categorisation: a category cue, then the word to judge against it, with answer holding the correct response key so the data are scoreable. Counterbalanced by Latin-square rotation, so a participant never sees the same target twice.
• counterbalance.optimise (off by default) assigns item sets to lists so the lists are equated on the declared dimensions, where the old deal went by set rank. The search is a deterministic integer descent with a keyed-hash tie-break, so it uses no random number generator and both engines produce the same assignment. balance_lists() is exported.
• New item source pool: a supplied word list goes through the matcher without having to masquerade as a corpus lexicon. load_pool() is exported. The neighbourhood dimensions are computed against the lexicon’s words, because a word’s neighbours are its neighbours in the language.
• A design may name norm tables in a norms: block. They are joined onto the lexicon before the candidate pool is built, so a semantic dimension the corpus does not carry (concreteness, age of acquisition, valence) can be filtered on, matched on or spanned like any other. No norm data is bundled. Every joined table is recorded in the materials datasheet with its checksum and its per-column coverage, because a norm table can supply the very variable a design manipulates.
• Datasheet version 1.1. It adds materials_source$norms and, for a pair-keyed design, a relational block naming the members, the pair count, the member lexicon and its checksum, and the member-level dimensions separately from the relational ones. selection$cross_engine no longer reports “n/a (user-supplied items)” for a pair-keyed continuous design: that design does perform a selection, and it is byte-identical across engines.
• merge_norms() returns the lexicon with the norm columns appended, in the lexicon’s own row and column order. It previously used merge(), which hoists the join column to position 1 where pandas keeps the left frame’s order, so the two engines disagreed on column order whenever on was not already first. The join key is now case- and whitespace-folded on the lexicon’s side too, where only the norm table’s was folded before: a lexicon holding Dog used to match nothing and leave an all-NA dimension. A norm column whose name already exists on the lexicon is now an error. Renaming it to frequency.x / frequency.y, as merge() did, left the matched dimension under a name nothing looks for.
• write_datasheet() and write_run_log() now write LF on every platform. They used a text-mode connection, so on Windows the datasheet, its Markdown rendering and the Markdown run log came out CRLF while the Python engine’s twins were LF. The datasheet is the provenance record. Its bytes no longer depend on the machine that built it.
• add_pair_overlap() and resolve_trial_timing() are now exported in fact as well as in the documentation. Both were marked for export and documented, but the NAMESPACE had not been regenerated, so library(lexsync) did not make them available.
• The materials datasheet now reports the candidate-pool size per condition (selection transparency, making item-selection bias auditable) and a suggested crossed mixed-model formula that guards against the language-as-fixed-effect fallacy.
• Browser (jsPsych) experiments gain a welcome/instructions screen, per-row item metadata (condition, item id, list), and a completion screen that saves the collected data as a CSV download.
• The realised-control report and datasheet gain a variance ratio per dimension, a distributional balance check that complements Cohen’s d and TOST.
• Wuggy-style subsyllabic pseudoword generation (opt-in items.generation.method: subsyllabic): whole onset/nucleus/coda constituents are swapped for attested same-role, same-length alternatives, preserving syllabic structure and length. Byte-identical across engines, and the default letter-substitution generator is unchanged.
• Continuous (non-dichotomised) design mode: declare a continuous block and select_continuous_stimuli() spans a predictor’s range evenly while holding the controls near-constant, with predictor-control correlations and a regression suggested-model in the datasheet. Byte-identical across the R and Python engines.
• Two new matching methods: mahalanobis (a covariance-aware distance that down-weights correlated dimensions) and optimal (a globally optimal assignment for two-condition designs, using the suggested clue package). Unlike the default methods, these use a covariance inverse and an assignment solver, so the R and Python engines agree closely but not byte-for-byte on them.
• An unknown matching.method, and a candidate pool too small for the requested n_per_condition, now raise an actionable error. Each used to fall back silently, to a default method or to a short set. The Python engine raises the same message, and code that relied on the old fallback will now stop.
• stringi is a new hard dependency (Imports). The canonical word key is case-folded with ICU at the root locale, so the key no longer depends on the machine’s locale and matches the Python engine byte for byte. shiny, bslib, DT and zip are new Suggests, for the Shiny app.
• Ten functions are newly exported, matching the Python package’s public surface: PARADIGMS(), build_datasheet(), build_lexdec_stimuli(), count_syllables(), generate_pseudowords(), make_pseudoword(), methods_paragraph(), required_fields(), resolve_events() and write_datasheet().
• tost_equiv() now defaults to bound_d = 0.5, the value the Python engine already used. The R default was 0.4, so the equivalence bound is wider and a comparison is easier to declare equivalent. Reported verdicts can change for the same data.
• describe_stimuli() now orders rows by each group’s first appearance, matching pandas. This changes the row order of generated descriptives.
• OpenSesame experiments now present trials in the seeded counterbalanced order. The order was previously randomised again at run time, so what ran was not what the pipeline generated and recorded.
• Breaking change: trial order within each counterbalancing list now comes from a seeded, keyed-hash shuffle shared with the Python engine. Each row is ranked by the SHA-256 digest of seed|replicate|list|set|condition, a tuple that identifies the trial uniquely under either counterbalancing recipe, so the permutation is a pure function of the design: byte-identical from both engines on any platform, and different for every seed. Previously the order was drawn from sample(), which could never match numpy’s generator for the same seed, so the trial lists were the one engine-specific artefact. All 75 generated experiment files across the 15 designs bundled at the time are now byte-identical across the engines, and the parity gate now compares the trial column of the stimuli CSVs. Stimulus selection, pairing and lists are unchanged, but every design’s trial order changes relative to the previous artefacts. The package no longer uses R’s random-number generator at all, so a seeded run cannot perturb the calling script’s random stream and there is no RNG state to save or restore.
• merge_norms() preserves the lexicon’s row order, and participant_table() crosses factors in expand.grid() order in both engines.
• Datasheets record the tolerance windows and pseudoword generator that ran, filter dimensions as the Python engine does, and report the installed package version they were built by.
• match_stimuli() raises where it used to re-pick an already-used row, when a relaxed window re-admits candidates missing a matched dimension. Such a candidate has no defined distance and is never assigned, yet it still counted towards the pool-size guard. An NA-depleted pool could therefore pass the guard and go on to emit the same word in several sets.
• match_stimuli() and select_continuous_stimuli() no longer select an all-NA row when the tolerance window is NA (an anchor of a single item gives sd = NA). An undecided comparison now resolves to FALSE, as it does in Python, so the window is relaxed and a real word is selected.
• The generated PsychoPy script, OpenSesame experiment and jsPsych page are now byte-identical to the Python engine’s, trial lists included (see the keyed-hash shuffle entry above).
• Selected stimuli are unchanged for all 15 designs bundled at the time.
• Every vignette now turns console colour off and fixes the console width while it renders. pkgdown passes the calling terminal’s colour support into its build subprocess, so a coloured message or error would otherwise reach the reader as escape sequences in the middle of the text.
• See the top-level CHANGELOG.md for the full, cross-language history and the planned methodological roadmap.

lexsync 0.1.0

• First release: multilingual corpus access, parallel multidimensional matching, counterbalancing, item resampling, deterministic pseudoword generation, and generation of hardware-timed PsychoPy, OpenSesame and jsPsych experiments. The R and Python engines select byte-identical stimuli, and every run ships a materials datasheet (provenance, checksums, realised control) and a pre-registration template.

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