organization of this directory is moving towards this approach:
<module>.h -- public API and data types
<module>_private.h -- protected API and data types
<module>.c -- implementation and private API / types
The rules are:
.c files may include *_private.h.
.h files may not include *_private.h
This allows us to have a nicely encapsulated C api with opaque data types and private functions
that are nonetheless shared between source files without redundant extern declarations..
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