I've noticed that send-keys does not accept values larger than 0xffff. This is an issue because U+1f4a9 is very popular with tmux integration users on iTerm2. The cause is that key_string_lookup_string scans a short int and rejects values with a length greater than four. Non-BMP values are accepted as UTF-8 input through the TTY. Is this intentional? I see that the high bits of key_code are reserved, but that that could be safely masked off since Unicode only uses 21 bits.
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