substring_codepoint
String.substring_codepoint
create substring of this string consisting of codepoints from (inclusive) .. codepoint_length (exclusive).
Precondition
pre debug : 0 ≤ from (debug 2): from ≤ codepoint_length
0.095dev (GIT hash 24f243f66c4524d1213ce09701f02534d7405377)