Bind forwarding

[techniq]

Describe the bug
It took me a while to determine this was the root issue, but I was expecting bindings to be forwarded/redirect to the base component when spreading the remaining props.

// App.js
<SomeComponent bind:value />

// SomeComponent.js
<BaseComponent {...$$restProps} />

// BaseComponent.js
<input bind:value />

To Reproduce
I've setup a REPL that should demonstrate the issue / feature

Expected behavior
The binded value in App.js is bound to the BaseComponent value

Information about your Svelte project:

• Your browser and the version: Chrome 86

• Your operating system: OS X 10

• Svelte version: 3.29.7

Severity
The issue can be worked around by declaring a local variable within the middle "SomComponent" and binding to it (see Redirect component in REPL). Since this is a common pattern I'm using, it requires a lot of duplication and not sure if there is any side effects to this "re-binding", but can work around at the moment.

Additional context
This looks related to #5106, but smaller scope (specially about bind forwarding).

[zyxd]

Duplicate of #2226, #5137