KITFORMA · EDITORIAL ANSWER
Why does lowercasing a technical identifier change when Java runs with a Turkish locale?
KitForma editorial guide. Human-language casing and protocol normalization are different tasks. The process default locale can make an apparently harmless transformation environment-dependent.
Step-by-step answer
Human-language casing and protocol normalization are different tasks. The process default locale can make an apparently harmless transformation environment-dependent.
For a protocol whose rule is locale-independent lowercase, use
identifier.toLowerCase(Locale.ROOT) after validating the permitted alphabet. For a person’s displayed text, use the intended language locale instead. Do not apply root-locale normalization to every name merely to obtain stable machine tests.
Run the same identifier fixtures under English and Turkish defaults and compare normalized keys. Include I and non-ASCII input if your protocol permits it. Locale.ROOT does not define a universal case-folding, Unicode normalization or security policy for visually confusable identifiers.Sources and verification
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