End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
StringIO#internal_encoding
strio.internal_encoding => encoding
ext/stringio/stringio.c
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static VALUE
strio_internal_encoding(VALUE self)
{
return Qnil;
}
Returns the Encoding of the internal string if conversion is specified. Otherwise returns nil.