fix: corner case error when counters _id is duplicated #7
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The duplicate may from arguments passed from user:
``` javascript
autoIncrement.getNextSequence(db, 'test', 'ID', function(e, ID) {})
... ...
autoIncrement.getNextSequence(db, 'test', 'ID2', function(e, ID) {})
```
Before this PR, `ID2` will never show any errors, but the program hang, because the error message is:
```
{
name: 'MongoError',
message: 'E11000 duplicate key error index: test3.counters.$_id_ dup key: { : "test" }',
ok: 0,
errmsg: 'E11000 duplicate key error index: test3.counters.$_id_ dup key: { : "test" }',
code: 11000
}
```
See, the error code is also `11000`, but should throw in this case.
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The duplicate may from arguments passed from user:
Before this PR,
ID2will never show any errors, but the program hang, because the error message is:See, the error code is also
11000, but should throw in this case.