perl bug with references

I found an odd behavior.

when I have a reference, let's say it is an array, it seems to pad the
value differently in perl 5.6 vs 5.8:

this worked in perl 5.8 but not perl 5.6:

$ref =~ /^ARRAY/;

for 5.6, I had to change to =~ /^\s*ARRAY/;

could not find anything mentioning this behavior anywhere. I doubt it
is a "feature"

.

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