Seed version. The seed should be a single value if fun is a single
function. If fun is multiple functions, then seed should be a
std.typecons.Tuple, with one field per function in f.
For convenience, if the seed is const, or has qualified fields, then
cumulativeFold will operate on an unqualified copy. If this happens
then the returned type will not perfectly match S.
Seed version. The seed should be a single value if fun is a single function. If fun is multiple functions, then seed should be a std.typecons.Tuple, with one field per function in f. For convenience, if the seed is const, or has qualified fields, then cumulativeFold will operate on an unqualified copy. If this happens then the returned type will not perfectly match S.