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SkyZeroZx 528a34f766 fix(core): avoid caching missing locale data
Only cache locale data loaded from the global locale registry when an actual locale entry is found.

This prevents attacker-controlled missing locale identifiers from being retained indefinitely in SSR when locale lookup falls back to a parent locale or the built-in English locale, avoiding unbounded process memory growth in locale-aware pipes and formatters.

(cherry picked from commit 98f42eaaae)
2026-06-15 17:53:12 +00:00
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