The upcoming C23 Standard adds a keyword _BitInt() which can be used, as I understand, to define an integer with a specific number of bits. However I could not find much information with regards to the in-memory representation of types declared this way, and any behavior that relates to their in-memory representation such as their size or alignment.
As such, is there any difference in terms of behavior, representation, or alignment requirements between _BitInt() types and 'real' integer types of the same bit width? For example, between _BitInt(32) and int32_t or int_least32_t? And is it well-defined to type-pun between them?