[perl #125251] Usage does not print required type for positional params in MAIN

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# New Ticket Created by  Pawel Pabian 
# Please include the string:  [perl #125251]
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Named params print required types:

17:33 bbkr: r: sub MAIN (Int :$x!) {...}
17:33 camelia: rakudo-{moar,jvm} c2a57e: OUTPUT«Usage:␤  /tmp/tmpfile -x=<Int> 
␤»


However positional types does not:

17:33 bbkr: r: sub MAIN (Int $x!) {...}
17:33 camelia: rakudo-{moar,jvm} c2a57e: OUTPUT«Usage:␤  /tmp/tmpfile <x> ␤»


I think this is bug because type is more important than irrelevant variable 
name.
Expected output is: "Usage:␤  /tmp/tmpfile <Int>"