When dealing with data structures and you want something to occur at all levels, it is said to occur "in depth" or "deeply", or is said to be "deep". GrandFather's solution merges deeply, while xorl and Corion's solution merge shallowly.

In reply to Re: Combining / Merging two Ho(H|A)s by ikegami
in thread Combining / Merging two Ho(H|A)s by jkva

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