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 250922c42fb1dcef5ce7ce89820538f53498ca37)