Integer conversion raising en exception

[ljulliar]

When trying to call an exported WASM function from Ruby with a negative integer parameter an exception is raised.

The function call is:
@exports.i32_to_s.call(-1)
the parameter signature of the WASM func is i32

and the exception raised is
TypeError: out of range integral type conversion attempted

I have no trouble passing a positive value.
Is this the expected behavior ? How can I pass a negative value ? Do i Have to pass the 2-complement positive value (meaning 65535 here) ?

Thank you for your help.