fix json decode (#424)

* fix json decode

stdlib/json/decode.go

@@ -65,7 +65,7 @@ func (d *decodeState) scanNext() {
 func (d *decodeState) scanWhile(op int) (isFloat bool) {
 	s, data, i := &d.scan, d.data, d.off
 	for i < len(data) {
-		if data[i] == '.' {
+		if data[i] == '.' || data[i] == 'e' || data[i] == 'E' {
 			isFloat = true
 		}
 		newOp := s.step(s, data[i])

stdlib/json/json_test.go

@@ -59,6 +59,7 @@ func TestJSON(t *testing.T) {
 		"arr": ARR{1, 2, 3, MAP{"a": false, "b": 109.4}}})
 
 	testJSONEncodeDecode(t, MAP{"id1": 7075984636689534001, "id2": 7075984636689534002})
+	testJSONEncodeDecode(t, ARR{1e3, 1E7})
 }
 
 func TestDecode(t *testing.T) {