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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Encoding#dummy?

enc.dummy? → true or false

Returns true for dummy encodings. A dummy encoding is an encoding for which character handling is not properly implemented. It is used for stateful encodings.

Example
Encoding::ISO_2022_JP.dummy?       #=> true
Encoding::UTF_8.dummy?             #=> false
See also #ascii_compatible? #inspect .name_list #name also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1