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Previously, $validate would execute the parsers to obtain a modelValue for validation. This was necessary, because a validator that is called outside of model / view update (e.g. from an observer) otherwise might only an undefined modelValue, because a previous view update has found a validation $error and set the model to undefined (as is tradition in angular) This is problematic as validators that are run immediately after the ngModelController initializes would parse the modelValue and replace the model, even though there had been no user input. The solution is to go back to an older design: the ngModelController will now internally record the $$rawModelValue. This means a model or view update will store the set / parsed modelValue regardless of validity, that is, it will never set it to undefined because of validation errors. When $validate is called, the $$rawModelValue will passed to the validators. If the validity has changed, the usual behavior is kept: if it became invalid, set the model to undefined, if valid, restore the last available modelValue - the $$rawModelValue. Additionally, $validate will only update the model when the validity changed. This is to prevent setting initially invalid models other than undefined to undefined (see #9063) Fixes: #9063 Fixes: #9959 Fixes: #9996 Fixes: #10025 Closes: #9890 Closes: #9913 Closes: #9997 Closes: #10048