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That pass was scripted with PowerShell, and Get-Content -Raw decodes as the
ANSI codepage on Windows PowerShell 5.1 rather than UTF-8. Every non-ASCII
character round-tripped through cp1252 and was re-encoded, so the ellipsis
and arrow characters turned into "a-hat" sequences -- visible in the legend
("768D -> 3D") and in the projection loading message. The result is still
valid UTF-8, so it compiled, passed tests, and shipped.
cp1252 has undefined byte values that decode to U+FFFD, so the transform
loses information and cannot be reversed byte-for-byte. The five affected
files are instead restored from 4f7c116, the commit before the pass; nothing
has touched them since. Set-Content -Encoding utf8 had also added BOMs to
three further files, which are stripped here.
Adds scripts/check_encoding.py and wires it into CI as its own job. This
class of corruption is invisible to both the type-checker and the test suite
-- the only symptom is garbage in the rendered UI -- so it needs a check that
looks at the bytes. Verified it fails on reintroduced corruption and passes
on the repaired tree.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The first CI run failed on the checker's own source. Its patterns are, by definition, the character sequences it hunts for, so spelling them literally made the file trip its own check -- and the U+FFFD constant did the same. Excluding the file from the scan would have been the easy fix, but then genuine corruption in it would go unnoticed. Instead the patterns are built from numeric code points, so the source stays pure ASCII and the checker can scan itself like any other file. Verified: source is ASCII, the code points still decode to the intended pairs, all four sample corruptions are matched, exit 1 on injected corruption and exit 0 on the clean tree. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
fix: repair mojibake introduced by the American English pass
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