fix type-stability for factoring weird Integer types. (#146)

* fix type-stability for factoring weird Integer types.

* Update Project.toml

Author: oscardssmith

Project.toml

@@ -1,6 +1,6 @@
 name = "Primes"
 uuid = "27ebfcd6-29c5-5fa9-bf4b-fb8fc14df3ae"
-version = "0.5.4"
+version = "0.5.5"
 
 [deps]
 IntegerMathUtils = "18e54dd8-cb9d-406c-a71d-865a43cbb235"

src/Primes.jl

@@ -346,7 +346,7 @@ function iterate(f::FactorIterator{T}, state=(f.n, T(3))) where T
         n == 0 && return (T(n), 1), (T(1), p)
     end
     tz = trailing_zeros(n)
-    tz>0 && return (T(2), tz), (n >> tz, p)
+    tz>0 && return (T(2), Int(tz)), (n >> tz, p)
     if n <= N_SMALL_FACTORS
         p = _min_factor(n)
         num_p = 1