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@ngdoc error
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@name ngModel:constexpr
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@fullName Non-Constant Expression
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@description
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Some attributes used in conjunction with ngModel (such as ngTrueValue or ngFalseValue) will only
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accept constant expressions.
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Examples using constant expressions include:
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```
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<input type="checkbox" ng-model="..." ng-true-value="'truthyValue'">
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<input type="checkbox" ng-model="..." ng-false-value="0">
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```
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Examples of non-constant expressions include:
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```
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<input type="checkbox" ng-model="..." ng-true-value="someValue">
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<input type="checkbox" ng-model="..." ng-false-value="{foo: someScopeValue}">
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```
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