With function names supposed to be short, I wonder why 'repeat is spelled out in full. Wouldn't 'rpt be more appropriate? If repeat is rarely used then I guess this is a non-issue.
I think "repeat" is one of the less-frequently used arc functions. The "Huffman encoding" philosophy would be to keep the name longer in order to improve clarity- Shortening this name, IMHO, would just be a small step towards the "line noise" problem that perl has.
'rpt seems a little too short. Sucking the vowels out of a word makes it harder to remember. The shortened names that work the best are ones like 'rev and 'rem that are easy to pronounce.