Locale.FromIdentifier accepts synthetic locale identifiers

Status: Fixed
Fixed in: v26.6.8
Source discussion: https://forum.objo.dev/d/498-locale-method-localefromidentifier-return-error
Last updated: 2026-06-30

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Public summary

Locale.FromIdentifier() and Locale.IsValidIdentifier() currently accept synthetic culture names such as 1111 because the runtime uses .NET culture lookup without restricting results to predefined platform cultures. These identifiers should be rejected so invalid locale input has predictable validation behaviour.