@@ -59,7 +59,7 @@ Directories come first, in alphabetical order, then the individual files worth t
 
 #### `swc/`
 
-- **Purpose**: swc's repository, read only under `crates/swc_ecma_minifier/tests`: its fixtures with their configs, the tests `exec.rs` and `mangle.rs` write inline, and the libraries it measures itself on. Each is held to terser's bytes like the terser corpora; a test with an `expected.stdout`, and every `exec.rs` test, also has its outputs run, and each fixture's recorded `output.js` is what `JS_MINIFY_REPORT=<file>` compares sizes against.
+- **Purpose**: swc's repository, read only under `crates/swc_ecma_minifier/tests`: its fixtures with their configs, the tests `exec.rs` and `mangle.rs` write inline, and the libraries it measures itself on. Each is held to terser's bytes like the terser corpora; a test with an `expected.stdout`, and every `exec.rs` test, also has its outputs run, and webpack's output may be no bigger than each fixture's recorded `output.js`, nor than what swc's port of a terser case records when its `passing.txt` lists it, unless `SWC_SMALLER` lists why.
 - **Usage**: Git submodule — initialize with `git submodule update --init --depth 1 test/external/swc`. Test runner: `test/specCases/minify-corpora.spectest.js` (`yarn test:minify-corpora`).
 
 #### `terser/`
 
@@ -38,5 +38,5 @@ Read this before touching the CSS, HTML or JavaScript parser, printer or minifie
 
 - `syntax.js` reaches `parser` and `printer` through getters: parsing never loads the printer, and the printer loads the parser only for its `parse` phase.
 - `syntax-parser.js` — tokenizer, acorn-derived core and every production in one file (any parse reaches the productions, and the coming struct-of-arrays rewrite moves node creation through them). `regexp.js` (pattern validator) is the one on-demand piece, reached only for a pattern the host engine rejected — never `require` it from a build path.
-- `syntax-printer.js` — webpack's JavaScript minifier, terser's design ported to write byte for byte what terser writes; `jsMinify.js` (the `minify` the default minimizer dispatches JS to) goes through it when given `printer: true` — which `optimization.minimizeOptions.javascript` defaults to under `experiments.futureDefaults` — and through terser as published otherwise — the user's own, as `terser-webpack-plugin` brings it, since webpack lists terser only as a devDependency; the printer itself never loads terser. `createModules` builds what terser's modules exported — the node classes from `nodeClasses()` (`createAst`), the parser (`createTerserParser`), the compressor and the output stream — and each entry of `PHASES` installs one part onto them: add phases there and nowhere else. `correct` wraps the methods with which terser writes a wrong program and changes only that output; `corrections.enabled` switches it off. The `parse` phase builds the tree from `syntax-parser.js` (`createTerserTree`), leaving to the ported parser a source terser reads unlike the spec; `syntax-printer-parse.unittest.js` holds that to terser's parse over acorn's corpus, `syntax-printer-terser-parser.unittest.js` the ported parser and `syntax-printer-estree.unittest.js` the ESTree conversion. `test/specCases/minify-corpora.spectest.js` holds the whole printer to terser's output, errors included, over each corpus in its `CORPORA` list (add a new one there) under the option sets in `OPTION_SETS`, and runs each output whose test states what its input prints (terser's `expect_stdout`, swc's `expected.stdout` and `exec.rs`) in terser's sandbox. A byte difference is accepted only where switching the `correct` phase off gives terser's bytes back; what it fixes is listed in `CORRECTED` (printing right with the phase, as terser without), and an output misprinting as terser's by an option's own contract in `INHERITED`, each with the reason — an entry that stops matching fails until retired. `JS_MINIFY_REPORT=<file>` lists where swc's recorded output is smaller — leads for printing less, never a failure. terser's corpus submodule is pinned to the `terser` devDependency — bump both together, and regenerate `data.js`.
-- `yarn test:minify-corpora` — webpack's JS minifier vs the published one it replaces, byte for byte (errors included), over every JS corpus: terser's own `test/compress` and `test/input`, test262, and swc's minifier tests; where a test states what its input prints, the output is also run and must print it. `JS_MINIFY_REPORT=<file>` writes where swc's recorded output is smaller.
+- `syntax-printer.js` — webpack's JavaScript minifier, terser's design ported to write byte for byte what terser writes; `jsMinify.js` (the `minify` the default minimizer dispatches JS to) goes through it when given `printer: true` — which `optimization.minimizeOptions.javascript` defaults to under `experiments.futureDefaults` — and through terser as published otherwise — the user's own, as `terser-webpack-plugin` brings it, since webpack lists terser only as a devDependency; the printer itself never loads terser. `createModules` builds what terser's modules exported — the node classes from `nodeClasses()` (`createAst`), the parser (`createTerserParser`), the compressor and the output stream — and each entry of `PHASES` installs one part onto them: add phases there and nowhere else. `correct` wraps the methods with which terser writes a wrong program and changes only that output; `corrections.enabled` switches it off. The `parse` phase builds the tree from `syntax-parser.js` (`createTerserTree`), leaving to the ported parser a source terser reads unlike the spec; `syntax-printer-parse.unittest.js` holds that to terser's parse over acorn's corpus, `syntax-printer-terser-parser.unittest.js` the ported parser and `syntax-printer-estree.unittest.js` the ESTree conversion. `test/specCases/minify-corpora.spectest.js` holds the whole printer to terser's output, errors included, over each corpus in its `CORPORA` list (add a new one there) under the option sets in `OPTION_SETS`, and runs each output whose test states what its input prints (terser's `expect_stdout`, swc's `expected.stdout` and `exec.rs`) in terser's sandbox. A byte difference is accepted only where switching the `correct` phase off gives terser's bytes back; what it fixes is listed in `CORRECTED` (printing right with the phase, as terser without), and an output misprinting as terser's by an option's own contract in `INHERITED`, each with the reason — an entry that stops matching fails until retired. Each output is also sized against swc's recorded one, a fixture's `output.js` or, for one of terser's cases, what swc's port of it records (gzip decides, raw breaks a tie): one bigger fails unless `test/helpers/swcSmaller.js` lists it under what swc does that webpack does not yet, and a listed one no longer bigger fails until retired. `JS_MINIFY_REPORT=<file>` tallies where webpack's is worse, the same and better. terser's corpus submodule is pinned to the `terser` devDependency — bump both together, and regenerate `data.js`.
+- `yarn test:minify-corpora` — webpack's JS minifier vs the published one it replaces, byte for byte (errors included), over every JS corpus: terser's own `test/compress` and `test/input`, test262, and swc's minifier tests; where a test states what its input prints, the output is also run and must print it. Each output must also be no bigger than swc's recorded one unless `SWC_SMALLER` lists why; `JS_MINIFY_REPORT=<file>` tallies worse, the same and better.