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
0.099dev (GIT hash 9b94ad4b4a4bff2bf2be7d77be2c6e1fd7683c4d)