Move int.toF() function into io module

poseidon2.nim

@@ -8,5 +8,6 @@ export sponge
 export compress
 export merkle
 export toBytes
+export toF
 export elements
 export types

poseidon2/io.nim

@@ -1,6 +1,7 @@
 import ./types
 import constantine/math/arithmetic
 import constantine/math/io/io_bigints
+import constantine/math/io/io_fields
 import constantine/math/config/curves
 
 export curves
@@ -35,3 +36,9 @@ iterator elements*(bytes: openArray[byte], _: type F): F =
   let finalChunk = bytes[chunkStart..<bytes.len] & endMarker
   let finalElement = F.fromOpenArray(finalChunk)
   yield finalElement
+
+# Remark: since `fromInt()` does not work at compile time, this doesn't either
+func toF*(a: int) : F =
+  var y : F
+  y.fromInt(a)
+  return y

poseidon2/types.nim

@@ -18,12 +18,6 @@ func getZero*() : F =
   setZero(z)
   return z
 
-# Remark: since `fromInt()` does not work at compile time, this doesn't either
-func toF*(a: int) : F =
-  var y : F
-  y.fromInt(a)
-  return y
-
 #-------------------------------------------------------------------------------
 
 const zero* : F = getZero()

tests/poseidon2/testCompress.nim

@@ -1,6 +1,6 @@
 import std/unittest
 import constantine/math/arithmetic
-import poseidon2/types
+import poseidon2/io
 import poseidon2/permutation
 import poseidon2/compress
 

tests/poseidon2/testPermutation.nim

@@ -3,9 +3,9 @@ import std/unittest
 import constantine/math/arithmetic
 import constantine/math/io/io_fields
 import constantine/math/io/io_bigints
-import constantine/math/config/curves
 
 import poseidon2/types
+import poseidon2/io
 import poseidon2/permutation
 
 suite "permutation":

tests/poseidon2/testSponge.nim

@@ -5,6 +5,7 @@ import constantine/math/io/io_fields
 import constantine/math/arithmetic
 
 import poseidon2/types
+import poseidon2/io
 import poseidon2
 
 #-------------------------------------------------------------------------------