Write register contents to file

I would like to write the contents of a register to a file. Easy enough to
grab the contents with let variable = getreg('a'). It would then be easy
if :echo variable > file worked like unix echo, but it doesnt. Any simple way
to get contents of some register a into a file of my choosing? There is a
writelist() function, but I do not know how to get the context of a register
into a list.

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