Make sure to use error wrapping and Errors.Is

[AnomalRoil]

Instead of comparing error strings:

if !strings.Contains(err.Error(), tlock.ErrTooEarly)

Also it would allow us to make sure our errors are compatible Errors.Is, which I'm currently not convinced of, since they seem to be const strings.

[ardan-bkennedy]

Great catch!!!

[gerep]

78dae76