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frontend/test/common/string
Franck Nijhof ce0e6a7665 Cache Intl.NumberFormat instances in formatNumber (#52583)
formatNumberToParts, the engine behind formatNumber, built a new
Intl.NumberFormat on every call. It is invoked for essentially every
numeric state render, and constructing an Intl.NumberFormat is
comparatively expensive.

Cache the formatters in a Map keyed by (locale, options). Unlike the
single-entry memoizeOne used for the date formatters, the number format
options are derived per value, so a multi-entry cache is needed to avoid
thrashing. The number of distinct combinations is small and bounded in
practice. Output is unchanged.
2026-06-13 17:01:33 +02:00
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