a forward sliceable range
a forward sliceable range
an EqualSpan Elements from a and b must be comparable for equality. If equalSpan is Drop (the default), then only Diff structs with Insert, Delete, or Replace tags will be returned; otherwise Diff structs covering all the input will be returned, so will additionally include Diff structs with Equal tags.
A slice of Diff structs.
Iterates two slices and diffs them.