[FEATURE ember-engines-mount-params] Constrain to model
hash arg.
#15325
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After discussion during a recent core team meeting, the original implementation
(and RFC) were determined to be a bit future hostile.
Specifically, with the implementation prior to this PR it would have been impossible to add any additional hash arguments that were targeting the
{{mount
syntax directly (e.g. namespacing for use with tree shaking) without breaking changes (since all hash arg names were allowed to be passed through before).This change updates things a bit to limit the pass through to the
model
hash argument, which actually makes things a tad bit more teachable anyways. The ability to pass down arbitrary named values is absolutely still present through the usage of the(hash
helper.