To make it change, force perl to make more buckets by adding more items to the hash.
Or tell perl that you are going to be adding more items to the hash. 
perl -wle'%h=%ENV; print ~~%h; keys %h = 1000; print ~~%h'

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In reply to Re^2: Effect of scalar function on hash by ysth
in thread Effect of scalar function on hash by bowei_99

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