Writing runtime-extensible code in Zig is massively inconvenient

[cancername]

@cancername

maybe a @abiLayout(.foobar_layout, T) builtin or something similar to guarantee a layout for that type would be a language-level solution?

Coincidentally, this would also make saving space by omitting the safety-checking tag possible without that cursed hack, assuming there are safe and unsafe ABIs: @AbiLayout(.unsafe, union{...}).