IRB uses Reline's 3 dynamic real-time callbacks with calling Ripper;
output_modifier_proc, prompt_proc, and auto_indent_proc. These processing
times make the paste time too long.
beec3399a8
The command prompt on Windows always uses Unicode to take input and print
output but most Reline implementation depends on Encoding.default_external.
This commit introduces an abstracted structure about the encoding of Reline.
