Add fixed u64 (#11555)

Co-authored-by: parity-processbot <>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/primitives/arithmetic/src/fixed_point.rs

@@ -2167,6 +2167,15 @@ implement_fixed!(
 	"_Fixed Point 64 bits signed, range = [-9223372036.854775808, 9223372036.854775807]_",
 );
 
+implement_fixed!(
+	FixedU64,
+	test_fixed_u64,
+	u64,
+	false,
+	1_000_000_000,
+	"_Fixed Point 64 bits unsigned, range = [0.000000000, 18446744073.709551615]_",
+);
+
 implement_fixed!(
 	FixedI128,
 	test_fixed_i128,