Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →
instance method
IO#internal_encoding
internal_encoding → encoding or nil
io.c
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static VALUE
rb_io_internal_encoding(VALUE io)
{
rb_io_t *fptr = RFILE(rb_io_taint_check(io))->fptr;
if (!fptr->encs.enc2) return Qnil;
return rb_enc_from_encoding(io_read_encoding(fptr));
}