frozen_string_literal: false

TkTextIO class :: handling I/O stream on a TkText widget
                           by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)

NOTE: TkTextIO supports 'character' (not 'byte') access only.
      So, for example, TkTextIO#getc returns a character, TkTextIO#pos
      means the character position, TkTextIO#read(size) counts by
      characters, and so on.
      Of course, it is available to make TkTextIO class to suuport
      'byte' access. However, it may break multi-byte characters.
      and then, displayed string on the text widget may be garbled.
      I think that it is not good on the supposed situation of using
      TkTextIO.
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