Feature Request: Decimal timestamps all the time

[gmacon]

Currently, dpkt.pcap.Reader returns the timestamp as a float if the pcap has microsecond resolution and as a decimal.Decimal if the pcap has nanosecond precision. I'd like to request that the timestamps be represented as Decimal objects all the time.

I realize that this will be a backwards-incompatible change, so I'd be OK with this behavior being opt-in for now, but I'd like to see it become the default behavior at some point.