Lowering temp_buffers minimum

Hi,

I am working on writing some tests for temporary tables. One of the tests is
that we correctly handle running out of buffer pins. That's a bit more
annoying than it needs to because the minimum for temp_buffers is 100.

It seems rather odd that our minimum for temp_buffers is 100 while the minimum
for shared_buffers, which is shared across connections!, is 16.

Does anybody see a reason we shouldn't lower temp_buffers to match
shared_buffers?

Greetings,

Andres Freund