substring_codepoint
String.substring_codepoint
create substring of this string consisting of codepoints from (inclusive) .. codepoint_count (exclusive).
Precondition
pre debug : 0 ≤ from (debug 2): from ≤ codepoint_count
0.097dev (GIT hash 0d8d2fabe31a27a00535b72694bf38cebdbb4cdd)