`svd` and friends fail for `BigFloat` and other non-primitive numbers.

[LilithHafner]

svd, svdvals, svdvals!, rank (and any functions that use these internally) do not support BigFloat. Presumably they also fail to support other non-BlasReal types.

julia> svd(BigFloat.(rand(5,5)))
ERROR: MethodError: no method matching svdvals!(::Matrix{BigFloat})