FFI: finish implementing .isa ffi features - #147
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In several places, support for foreign types such as enums and for foreign variables was incomplete and did not work if you replaced the configuration json file with the new .isa foreign import/export declarations.
The FFI was mapping SInt(N) to 'int' even when it was mapping Integer to int64_t. This caused problems because enabling -Obounded was changing the type of FFI functions. This fix makes them match.
I noticed that github tests were first installing 3.22.2 and then installing 3.24.2 so I am hoping that selecting 3.24.2 initially will make CI tests run faster
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When I tried replacing the config.json files in tests, I found that the new .isa ffi language features were not fully implemented.
So this finishes the implementation (but leaves config.json support in place until others are updated).
See changes in tests for the new .isa way.