bors-servo
0be2364850
add `CFNumberGetType` to determine specific number type
this PR adds support for `CFNumberGetType` that is needed if there is a `CFNumberRef` and it is not clear what sort of number it is.
Now it would be possible to do such a thing:
```rust
let type_id = unsafe { CFNumberGetType(value) };
match type_id {
si64 if si64 == kCFNumberSInt64Type => {},
si32 if si32 == kCFNumberSInt32Type => {},
_ => {},
}
```