Jacob Geiger

### What The new `credentials.rb` file does not have autogenerated test coverage. We should add coverage, will would be able to catch issues like https://github.com/GoogleCloudPlatform/google-cloud-ruby/issues/1837. This could either involve modifying...

### What Confirm that ``` my_api_client.idempotent_retrying_call(options=gax.CallOptions(timeout=123)) ``` in fact uses 123s as its initial timeout. If so, please close this bug. ### Why This ticket is just to confirm that...

What: Use `datetime.timedelta` for the gRPC timeout and the bundling `delay_threshold`. Currently we use numeric values, but we should additionally support Pythonic `datetime.timedelta` objects. Why: Be more Pythonic.

Compute bundled request size and buffer correctly

1

We've agreed that the bundling request size is to be computed by summing the bundled field sizes, with a 10% buffer to account for the underapproximation of the total request...

#28 introduces two pylint disable no-member directives; the errors that are suppressed seem to be spurious (given that the tests pass) but should still be investigated.