I'm trying to setup integration with PortAudio.jl so that I can sample from my computer's microphone, which samples on the order of tens of microseconds. I've tried constructing a Block with the times calculated based on the number of returns audio frames, however due to rounding (because DateTime only has Millisecond resolution), I receive an error in the Block constructor that my times are not strictly increasing.

As a workaround, I've defined a PreciseDateTime struct which contains a DateTime and Nanosecond, to provide greater specificity; unfortunately, Block is too restrictive and does not allow passing times with an eltype other than DateTime.

Would it be reasonable to relax this restriction and allow any <:AbstractDateTime instead? It would probably add some amount of complexity when mixing Blocks from multiple sources (as we then need to promote to the more precise time type), but that feels like an inevitable tradeoff when wanting to support finer time resolutions.