giles db7a3d10dd js-on-sx: NaN / Infinity resolve at transpile; strict-eq returns false for NaN ...

Previously NaN / Infinity were SX symbols that couldn't be (define)'d
because the SX tokenizer parses 'NaN' and 'Infinity' as numeric literals.

js-transpile-ident now rewrites NaN -> (js-nan-value), Infinity ->
(js-infinity-value), each a zero-arg function returning the appropriate
IEEE value ((/ 0.0 0.0) and (/ 1.0 0.0)).

Also fixes js-number-is-nan: in this SX, (= nan nan) returns true, so the
classic 'v !== v' trick doesn't work. Now checks (inspect v) against
'nan'/'-nan' strings.

Extends js-strict-eq: NaN === NaN returns false per ES spec.

8 new unit tests, 497/499 total.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-24 07:43:09 +00:00

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