Boolean field not accept input are 1, 0, "1", and "0".

[nambhd]

Hello,
I created a Vertex has 'flag' property is boolean type.
Then, I set $model->flag = 1;
When I save this model, I received error:
Value is not boolean. Expected true or false but received '1'.
Please help me go out of this bug.
Thank you!

[pin-cnx]

I though I fixed it already.
try
$model->flag = true;

[nambhd]

It worked fine when I create new Record.
But when I update this record (set $model->flag = false;), I received this error again.
Please check it.

[nambhd]

When I update boolean field with other value (Example: true -> false, or false -> true), I receive this error.