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Re-enabling native-comp surfaced a suite-wide fragility. When a test redefines a C primitive (or a native-compiled function), native-comp routes native callers through a trampoline that calls the mock with the primitive's maximum arity. A fixed-arity mock narrower than the primitive then throws wrong-number-of-arguments, intermittently, as the eln-cache fills.
I swept every arity-narrow subr mock to append &rest _ (188 sites, preserving any named args the body uses), and added tests/test-meta-subr-mock-arity.el, which fails make test on any subr mock too narrow for the primitive's arity. The rule isn't "never mock a subr". The suite mocks message and completing-read freely. It's "a subr mock must accept the primitive's arity."
Background, the three failure modes, and the research are in docs/native-comp-subr-mocking.org.
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cj/json-format-buffer, cj/yaml-format-buffer, and cj/webdev-format-buffer ran their formatters through shell-command-on-region, which goes via a shell. I moved each to call-process-region with an explicit program and argv list, so a filename or buffer content can't be word-split or read as shell syntax. The webdev path dropped its shell-quote-argument dance once the filename became a plain argv element.
Point preservation is unchanged. One deliberate improvement, and it's tested: shell-command-on-region with replace replaced the buffer with the formatter's error text on a non-zero exit. The new per-formatter helper captures output to a temp buffer, checks the exit code, replaces only on success, and otherwise raises a user-error carrying stderr — so a failed format leaves the buffer alone.
I kept a small format-region helper in each of the three modules rather than one shared helper. They have no common module to live in short of system-lib, and coupling three unrelated domain modules through it wasn't worth saving sixteen lines.
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I added `tests/test-prog-webdev-format.el` — 7 ERT tests over `cj/--webdev-format-command` (plain path, spaces-quoted, `.tsx`) and `cj/webdev-format-buffer` (prettier present → the region command targets `buffer-file-name`; the `file.ts` fallback when the buffer has no file; point clamps to `point-max` when the format shrinks the buffer; prettier missing → `user-error`). `executable-find` and `shell-command-on-region` are stubbed. `cj/webdev-keybindings` was already covered by `test-prog-webdev--format-wiring.el`.
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