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In practice almost nobody checks for failed allocation, including unfortunately
the serd tests and serdi itself. Adding a struct mode to conditionally define
this would be a good idea to support allocation-hardened code, but for now just
mark them as unspecified instead.
On the bright side, this documents the nature of the returned pointers nicely.
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This will warn if NULL is passed to any nonnull-annotated parameter, and is
also supported by sanitizers which can check for violations at runtime.
Unfortunately, it is currently only supported by clang. GCC has a similar
feature in the nonnull attribute, but this has a different syntax (it's a
function attribute) and is more dangerous since it is used by the optimizer to
assume a null pointer is undefined behavior. This one just warns and still
allows code to handle the situation gracefully, which I think is more
appropriate for a library API.
Note that this optimization behavior is not some unlikely edge case: switching
these attributes to the GCC one will break release builds.
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In exchange for suppressing a pointless superficial warning instead, but I
dislike that convention since it looks confusing when hex digits are used and
it's inconsistent with near-universal floating point suffix convention.
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