Decimals in JSON columns are being improperly coerced into strings when inserted into tables.

Reproduction steps:

```sql
CREATE TABLE test(j json);
INSERT INTO test VALUES (JSON_OBJECT("a", 1.0));
SELECT * FROM test;
SELECT * FROM test WHERE j =JSON_OBJECT("a", 1.0);
```

MySQL output:
```
mysql> select * from test;
+------------+
| j |
+------------+
| {"a": 1.0} |
+------------+

mysql> SELECT * FROM test WHERE j =JSON_OBJECT("a", 1.0);
+------------+
| j |
+------------+
| {"a": 1.0} |
+------------+
```

Dolt output:
```
json> select * from test;
+------------+
| j |
+------------+
| {"a": "1"} |
+------------+

select * from test where j = JSON_OBJECT("a", 1.0);
Empty set (0.00 sec)
```