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Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

Encoding::UndefinedConversionError#source_encoding_name

ecerr.source_encoding_name → string

Returns the source encoding name as a string.

See also #source_encoding #error_char also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0