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 c0597c5e4454e0a756871b577946c51ba77d9fde)