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MIT-licensed, client-side, JavaScript framework that makes building rich web applications easy.
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Sets whether model conversion should remove non existing attributes or merge with
the existing attributes. The default is `false`.
For example, if `Task.findOne({ id: 1 })` returns
```
{ id: 1, name: 'Do dishes', index: 1, color: ['red', 'blue'] }
```
for the first request and
```
{ id: 1, name: 'Really do dishes', color: ['green'] }
```
for the next request, the actual model attributes would look like:
```
{ id: 1, name: 'Really do dishes', index: 1, color: ['green', 'blue'] }
```
Because the attributes of the original model and the updated model will
be merged. Setting `removeAttr` to `true` will result in model attributes like
```
{ id: 1, name: 'Really do dishes', color: ['green'] }
```