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return [ map { $uid2msg{$_} } @$uids ];

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```
return [ @uid2msg{ @$uids } ];
```

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Benchmark: running hashslice, hashslice_pre, original, original_pre fo
+r at least 5 CPU seconds...
 hashslice:  5 wallclock secs ( 5.29 usr +  0.00 sys =  5.29 CPU) @ 97
+.35/s (n=515)
hashslice_pre:  5 wallclock secs ( 5.30 usr +  0.01 sys =  5.31 CPU) @
+ 1757.63/s (n=9333)
  original:  5 wallclock secs ( 5.30 usr +  0.00 sys =  5.30 CPU) @ 91
+.51/s (n=485)
original_pre:  5 wallclock secs ( 5.33 usr +  0.00 sys =  5.33 CPU) @ 
+817.07/s (n=4355)

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Benchmark: running hashslice, hashslice_pre, original, original_pre fo
+r at least 5 CPU seconds...
 hashslice:  5 wallclock secs ( 5.04 usr +  0.04 sys =  5.08 CPU) @  7
+.28/s (n=37)
hashslice_pre:  5 wallclock secs ( 5.27 usr +  0.01 sys =  5.28 CPU) @
+ 93.56/s (n=494)
  original:  5 wallclock secs ( 5.08 usr +  0.01 sys =  5.09 CPU) @  6
+.68/s (n=34)
original_pre:  6 wallclock secs ( 5.37 usr +  0.00 sys =  5.37 CPU) @ 
+46.93/s (n=252)

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use Benchmark;

...
  return $self->{uid};
}