30% Faster isHex for strings with 64 bytes.

benchmark/src/androidTest/java/com/vitorpamplona/quartz/benchmark/HexBenchmark.kt

@@ -100,17 +100,7 @@ class HexBenchmark {
     }
 
     @Test
-    fun newIsHex() {
-        val isHexChar =
-            BooleanArray(256).apply {
-                "0123456789abcdefABCDEF".forEach { this[it.code] = true }
-            }
-
-        r.measureRepeated {
-            for (c in hex.indices) {
-                if (!isHexChar[hex[c].code]) return@measureRepeated
-            }
-            return@measureRepeated
-        }
+    fun isHex64() {
+        r.measureRepeated { Hex.isHex64(hex) }
     }
 }