Meter: Speedup with Immutable MeterTerminal and MeterSequence#1972

Draft

mscuthbert wants to merge 18 commits into

meter-speed-2026

Commits on Jul 1, 2026

meter: MeterTerminal/MeterSequence.duration returns a shared FrozenDuration
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meter: make MeterTerminal an immutable, cached value object (~49% faster deepcopy)
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meter/duration: weight is always float; __copy__ for immutable objects; doc fixes
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meter: make MeterSequence an immutable, cached collection (deepcopy ~4x faster)
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meter: review fixes for the immutable MeterSequence
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meter: add modify()/__replace__ to MeterTerminal & MeterSequence; publicize makeSequence
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base: quarterLength setter no longer copy-on-writes a FrozenDuration
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meter/base: rename replaceElement->setIndex, add modify/cache tests, doc polish
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meter: cache TimeSignature.load's configured sequences (~96x faster construction)
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meter: cache list-divisions too (normalize list -> tuple for the load cache key)
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meter/tests: cache tests now assert the private caches are actually populated
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meter: note barDuration will become a FrozenDuration in v12
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meter: remove _meterSequenceAccentArchetypes cache (one caching layer)
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meter: type _defaultSequenceCache as a fixed 4-tuple (display, beam, beat, accent)
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meter: simplify getBeatDepth doctest (loop + build-then-set, documented)
mscuthbert
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Commits on Jul 2, 2026