Fix multipleOf incorrect negative exponent of 10 cases (#685)

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

DEPENDENCIES

@@ -1,3 +1,3 @@
 vendorpull https://github.com/sourcemeta/vendorpull 1dcbac42809cf87cb5b045106b863e17ad84ba02
-core https://github.com/sourcemeta/core 57e8c91ed68e3ee903526fd2f45cb16ca46759d8
+core https://github.com/sourcemeta/core 94b0c4860231adfb18bb8d16951089f95bc3cc4c
 jsonschema-test-suite https://github.com/json-schema-org/JSON-Schema-Test-Suite 06481b143722c8c06671bd40dcde99b422ffd531

test/evaluator/evaluator_draft4.json

@@ -9622,6 +9622,30 @@
       "descriptions": [ "The integer value 3 was expected to be divisible by the number 1.5" ]
     }
   },
+  {
+    "description": "multipleOf_23",
+    "schema": { "$schema": "http://json-schema.org/draft-04/schema#", "multipleOf": 0.01 },
+    "instance": 1280.32,
+    "valid": true,
+    "fast": {
+      "pre": [
+        [ "AssertionDivisible", "/multipleOf", "#/multipleOf", "" ]
+      ],
+      "post": [
+        [ true, "AssertionDivisible", "/multipleOf", "#/multipleOf", "" ]
+      ],
+      "descriptions": [ "The number value 1280.32 was expected to be divisible by the number 0.01" ]
+    },
+    "exhaustive": {
+      "pre": [
+        [ "AssertionDivisible", "/multipleOf", "#/multipleOf", "" ]
+      ],
+      "post": [
+        [ true, "AssertionDivisible", "/multipleOf", "#/multipleOf", "" ]
+      ],
+      "descriptions": [ "The number value 1280.32 was expected to be divisible by the number 0.01" ]
+    }
+  },
   {
     "description": "metadata",
     "schema": {

test/evaluator/evaluator_draft4_test.cc

@@ -1066,6 +1066,27 @@ TEST(Evaluator_draft4, multipleOf_19) {
       "The number value 0.3 was expected to be divisible by the number 0.1");
 }
 
+TEST(Evaluator_draft4, multipleOf_20) {
+  auto schema{sourcemeta::core::JSON::make_object()};
+  schema.assign_assume_new(
+      "$schema",
+      sourcemeta::core::JSON{"http://json-schema.org/draft-04/schema#"});
+  schema.assign_assume_new(
+      "multipleOf", sourcemeta::core::JSON{sourcemeta::core::Decimal{"0.01"}});
+
+  const sourcemeta::core::JSON instance{sourcemeta::core::Decimal{"1280.32"}};
+  EVALUATE_WITH_TRACE_FAST_SUCCESS(schema, instance, 1, "");
+
+  EVALUATE_TRACE_PRE(0, AssertionDivisible, "/multipleOf", "#/multipleOf", "");
+  EVALUATE_TRACE_POST_SUCCESS(0, AssertionDivisible, "/multipleOf",
+                              "#/multipleOf", "");
+
+  EVALUATE_TRACE_POST_DESCRIBE(
+      instance, 0,
+      "The number value 1280.32 was expected to be divisible by the number "
+      "0.01");
+}
+
 TEST(Evaluator_draft4, minimum_18) {
   auto schema{sourcemeta::core::JSON::make_object()};
   schema.assign_assume_new(