trim and escape commute for every input, so the new whitespace test does
not pin their order: UNPRINTABLE and LONE_SURROGATE are disjoint from the
set trim() strips, and both escapes emit plain non-whitespace ASCII,
leaving the leading and trailing whitespace runs byte-identical. State that instead of the false causal clause.
pyScalar's Literal path escapes nothing itself -- JSON.stringify is what
keeps it parseable, covering NUL and, under ES2019 well-formed
stringification, unpaired surrogates. Record the dependency and turn it
into a checked invariant. Pin the docstring emission site for a lone
surrogate too, mirroring the NUL case.
Two docstring corrections: describe's caller enumeration omitted the
synthetic { description } wrapper docLines builds, and "special in
statement position" does not describe `_`, which is special in a match
pattern. Both keep the conclusion they support.
Note which of the two table guards fires depends on the entry point.
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