diff --git a/tools/router/unmarshal_request_data.go b/tools/router/unmarshal_request_data.go
index dc111836..6152fbad 100644
--- a/tools/router/unmarshal_request_data.go
+++ b/tools/router/unmarshal_request_data.go
@@ -325,7 +325,8 @@ func inferValue(raw string) any {
 		// try to convert to number
 		//
 		// note: expects the provided raw string to match exactly with the minimal string representation of the parsed float
-		if raw[0] == '-' || (raw[0] >= '0' && raw[0] <= '9') && inferNumberCharsRegex.Match([]byte(raw)) {
+		if (raw[0] == '-' || (raw[0] >= '0' && raw[0] <= '9')) &&
+			inferNumberCharsRegex.Match([]byte(raw)) {
 			v, err := strconv.ParseFloat(raw, 64)
 			if err == nil && strconv.FormatFloat(v, 'f', -1, 64) == raw {
 				return v
diff --git a/tools/router/unmarshal_request_data_test.go b/tools/router/unmarshal_request_data_test.go
index 51b86e4f..047aa867 100644
--- a/tools/router/unmarshal_request_data_test.go
+++ b/tools/router/unmarshal_request_data_test.go
@@ -31,6 +31,7 @@ func TestUnmarshalRequestData(t *testing.T) {
 			"000001",
 			"-000001",
 			"1.6E-35",
+			"-1.6E-35",
 			"10e100",
 			"1_000_000",
 			"1.000.000",
@@ -328,7 +329,7 @@ func TestUnmarshalRequestData(t *testing.T) {
 			name:   "*map[string]any",
 			data:   mapData,
 			dst:    pointer(map[string]any{}),
-			result: `{"bool1":true,"bool2":[true,false],"json_a":null,"json_b":123,"json_c":[1,2,3],"mixed":[true,123,"test"],"number1":1,"number2":[2,3],"number3":[2.1,-3.4],"number4":[0,-0,0.0001],"string0":"","string1":"a","string2":["b","c"],"string3":["0.0","-0.0","000.1","000001","-000001","1.6E-35","10e100","1_000_000","1.000.000"," 123 ","0b1","0xFF","1234A","Infinity","-Infinity","undefined","null"]}`,
+			result: `{"bool1":true,"bool2":[true,false],"json_a":null,"json_b":123,"json_c":[1,2,3],"mixed":[true,123,"test"],"number1":1,"number2":[2,3],"number3":[2.1,-3.4],"number4":[0,-0,0.0001],"string0":"","string1":"a","string2":["b","c"],"string3":["0.0","-0.0","000.1","000001","-000001","1.6E-35","-1.6E-35","10e100","1_000_000","1.000.000"," 123 ","0b1","0xFF","1234A","Infinity","-Infinity","undefined","null"]}`,
 		},
 		{
 			name:   "valid pointer struct (all fields)",