gh-146238: add missing tests for 'e', 'Zf' and 'Zd' array type codes in test_buffer.py

[skirpichev]

This amends e79fd60.

• Issue: Support half-floats in the array module #146238

[skirpichev]

CC @vstinner

[vstinner]

On WASI, ALIGNOF_MAX_ALIGN_T is 16 bytes and struct.calcsize("Zd") is 16 bytes. WASI is a 32-bit platform (sys.maxsize is 2147483647). Maybe we should only test formats up to 4 bytes?

Would it make sense to use MAX_ALIGN = struct.calcsize('P')?

[skirpichev]

Would it make sense to use MAX_ALIGN = struct.calcsize('P')?

As you see from the commit history, just removing the 'Zd' type - works. But I would like to use a more generic solution.

[vstinner]

I prefer a small performance hit for readability.

I would prefer to not build list("bBhHiIlLefd") + ['Zf', 'Zd'] list at each NATIVE iteration, but it's not a big deal. I merged your PR. Thanks for additional tests.