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Do you know where your variables are?
 
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That would probably require:
local @data = @data;
else local @data would initialize empty. (At least it does, in my tests).

Suffers from "Can't localize lexical variable @data at ..."

Update: this works:

LOCAL_BLOCK_5: { local @data[0..$#data]; $_->{unit} = 'S' for @data; print Dumper \@data; }
Update 2: Just noticed kennethks solution below, that changes @data to a package (our) variable, and allows it to be localized.

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In reply to Re^2: Localizing hash keys in an AoH by NetWallah
in thread Localizing hash keys in an AoH by kennethk

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