[perl #129915] [LTA] ∞ as literal Inf not recognized in signatures

[Zoffix Znet via RT]

Another case: fancy pants −

<ZoffixW> m: sub foo (−42) {say "got it"}(−42)
<camelia> rakudo-moar b1f77c: OUTPUT«===SORRY!=== Error while compiling 
<tmp>␤Missing block␤at <tmp>:1␤------> sub foo (⏏−42) {say "got it"}(−42)␤»

<ZoffixW> m: sub foo (−Inf) {say "got it"}(−Inf)
<camelia> rakudo-moar b1f77c: OUTPUT«===SORRY!=== Error while compiling 
<tmp>␤Missing block␤at <tmp>:1␤------> sub foo (⏏−Inf) {say "got it"}(−Inf)␤»