Duration constraints can only handle 64-bit compatible values

[htuch]

The Duration protos is capable of representing values > time.Duration, see https://github.com/golang/protobuf/blob/master/ptypes/duration.go#L73 and https://github.com/google/protobuf/blob/master/src/google/protobuf/util/time_util.h#L61. The Go (but not C++) templates and checker.go requires a conversion to time.Duration, which won't work for these large numbers.

[htuch]

Same will be true for Timestamp

[rodaine]

time.Time is represented internally with seconds and nanos like the proto. That should work as intended for the timestamp. Duration will certainly need modification, however.

[htuch]

@rodaine yeah, but there is some common code in checker.go that might need addressing here. Worth adding a test for in any case.