thingy is what the reference points to, it may be hash, array, scalar, subroutine. What I'm saying, and what code demonstrates is that you can bless a hash, not just the reference as tobyink said.
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That makes sense.
Although bless() requires a reference to the thingy, bless() makes the thingy blessed, not the reference itself.
I didn't care this slight difference.
In this context, to bless a tied hash, we pass the reference (to a tied hash) to bless().
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