What do you assume when you see fromListN in a library?

[Carter Schonwald]

Hey everyone:
When you see fromListN as a function in a library, do you assume / presume
it’s expecting an exactly N element list ? Or do you expect/tolerate other
behavior ?

Should it reject shorter lists?

Should it truncate or reject longer lists?

A corner case of this came up in some bug discussion I was having regarding
vector,  and I shall claim and or presume that most folks assume exact size
with prompt rejection of too long or too short.

Thoughts please ?

-Carter
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