A function only belongs into a header file if we always want it inlined,
otherwise it belongs into a C file.

Again, why? Why don't we trust the compiler to decide if a function
should be inlined or not, even if the definition happens to be in a .h

It seems like a perfectly valid optimization for the compiler to only
emit code once for a function and then call it where it is used, even
if that function happens to be defined in a .h file.

- R.
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