The API explorer UI shows a hint (in parentheses) next to the text box for the parameter. If the parameter is of type long, the hint shown is (String), which is incorrect. If the parameter is of type double, the hint shown is (Number), which is correct.
Is this a bug in the API explorer or is there something I should do to fix the hint for long types?
Edit:
Just to clarify, this is observed with an API we have built with Google Endpoints.