Fixes faulty string comparison bug

Author: Antonis Lilis

src/main/kotlin/eu/afse/jsonlogic/JsonLogic.kt

@@ -230,7 +230,7 @@ class JsonLogic {
 
     private fun compareStrict(a: Comparable<*>?, b: Comparable<*>?) = when {
         a is Number && b is Number -> compareValues(a.toDouble(), b.toDouble())
-        a is String && b is String -> compareValues(a.doubleValue, b.doubleValue)
+        a is String && b is String -> compareValues(a.unStringify, b.unStringify)
         else -> -1
     }
 

src/test/kotlin/eu/afse/jsonlogic/JsonLogicTests.kt

@@ -154,4 +154,13 @@ class JsonLogicTests {
         val result = jsonLogic.apply(mapOf("pow" to listOf(3,2)))
         assertEquals("9.0", result)
     }
+
+    @Test
+    fun stringComparisonBug() {
+        val jsonLogic = JsonLogic()
+        val logic = mapOf("===" to listOf(mapOf("var" to listOf("a")), "two"))
+        val data = mapOf("a" to "one")
+        val result = jsonLogic.apply(logic, data)
+        assertEquals("false", result)
+    }
 }