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```
substr($t, 1, -1) =~ s/"/""/g;
```

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Benchmark: timing 1048576 iterations of sub, zwa...
       sub: 16 wallclock secs (15.07 usr +  0.00 sys = 15.07 CPU) @ 69
+580.36/s
...
       Rate  sub  zwa
sub 69580/s   -- -17%
zwa 83353/s  20%   --