Fixed invalid type annotation for multivalue returns

[RunDevelopment]

fixes #4207

Array itself is not a valid type because it requires one generic parameter. I replaced it with number[]. I chose number as the element type, because that's what the surrounding code is using for everything.

Using number for everything is probably wrong, since WASM uses bigint for 64-bit ints AFAIK, but it shouldn't matter too much.

[RunDevelopment]

CI fails because CI uses the latest stable compiler (Rust 1.82 now), which uses multi-value returns by default. This means that the generated WASM and JS code will be different in all tests now.

[daxpedda]

Yes, we should probably read out the ValueType, but this is already a bug, so this doesn't degrade the current state.