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Fix coercion of PK value in `replaceById` method

Before this change, when both the PK value (`id`) and the `data` object
were provided as plain-data values (e.g. as received in a JSON request),
and the connector was using a complex PK type (e.g. `ObjectID`
in MongoDB), then `replaceById` operation was printing confusing
warnings:

    WARNING: id property cannot be changed from 5d39775a59f5f541513c5e05
        to 5d39775a59f5f541513c5e05 for model:Post
        in 'before save' operation hook

    WARNING: id property cannot be changed from 5d39775a59f5f541513c5e05
        to 5d39775a59f5f541513c5e05 for model:Post
        in 'loaded' operation hook

This commit fixes the problem by applying the same type coercion on the
PK value (`id`) as has been applied by the model constructor on the PK
property (`data.id`).

Signed-off-by: Miroslav Bajtoš <mbajtoss@gmail.com>

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