parseAudioFxChain and serializeAudioFxChain each carried an anonymous map
callback that was, by measurement, the most complex code in the file: 18
cyclomatic / 17 cognitive and 10/9. Almost all of it was nine
`...(cond ? { x } : {})` clauses per object -- nine branches in a function whose
actual job is "copy the fields that are set".
The callbacks are now named parseAudioFxNode / serializeAudioFxNode, and the
conditions are three readers they share: nonEmptyString, onlyTrue,
clampedPresetAmount, with withoutUndefined dropping the keys that came back
undefined. Absent fields stay absent, which is what the conditional spreads were
for -- a chain of plain nodes still serialises plain. 3/1 and 4/1 now.
Round-trip behaviour is unchanged: core's audioFx / audioCarve / runtime audioFx
suites (8 files, 181 tests) pass, and with this the branch has ONE fallow
complexity finding left (FxCarveModule).
Vance Ingalls
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