Comment by amluto

Entire libraries are a weird sort of exception. They fundamentally target a specific architecture, and all the nonportable or version dependent data structures are self describing in the sense that the code that accesses them are shipped along with the data.

And if you load library A that references library B’s data and you change B’s data format but forget to update A, you crash horribly. Similarly, if you modify a shared library while it’s in use (your OS and/or your linker may try to avoid this), you can easily crash any process that has it mapped.