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$ perl pm_hash_clear_vs_undef_1214851.pl
Checking container differences between delete and clear:
...
delete    38049/s        --       -3%      -39%
reuse     39358/s        3%        --      -37%
overwrite 62375/s       64%       58%        --

$ cat pm_hash_clear_vs_undef_1214851.pl
use strict;
...
        fill_hash(\%h);
    },
});