Remove 'static
requirement from difference traits
#501
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Our difference traits,
Semigroup
,Monoid
, andAbelian
, have been defined to requireData
, which has been a helpful catch-all trait that includes'static
. However, it is reasonable to want to implement these traits for lifetimed data, for example aCow<'a, Diff>
type.This PR replaces
Data
withClone
in the requirements for the difference traits, and moves the'static
and occasionallyOrd
requirements to those locations where they are required. This is a bit noisier, but I think a bit more "accurate".