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[ty] Inline short AST string literals - #27601
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charliermarsh wants to merge 1 commit into
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charliermarsh
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a team,
MichaReiser and
dhruvmanila
as code owners
August 8, 2026 17:47
Memory usage reportSummary
Significant changesClick to expand detailed breakdownflake8
trio
sphinx
prefect
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Summary
Store regular string literals and interpolated-string literal segments in
CompactStringinstead ofBox<str>, avoiding separate heap allocations for short values.Update parser construction, Ruff rule autofixes, formatter normalization, AST comparison, and ty IDE references to use the new representation. Formatter normalization can now append directly to an existing literal instead of converting through an intermediate
String.CompactStringincreasesExprFStringfrom 56 to 64 bytes on 64-bit targets; the enclosingExprremains 72 bytes onmain. This isolates the allocation-versus-layout tradeoff from the separate expression-size reduction in #27591.