(scan_sexps_forward): Additional arg FROM_BYTE. Calls changed.
(find_defun_start): Additional arg POS_BYTE. Save final byte pos in find_start_value_byte. (find_start_value_byte): New variable. (Fforward_comment): Scan by bytes and chars. (Fbackward_prefix_chars): Scan by bytes and chars. (scan_words, scan_sexps_forward): Scan bytes as well as chars. (skip_chars, scan_lists): Scan by bytes and chars. Now static. (char_quoted): Take charpos and bytepos as args. (back_comment): Likewise. (update_syntax_table): Arg renamed. (inc_bytepos, dec_bytepos): New functions.
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