Allow a set option to be edited

[eric-g-97477]

Is your feature request related to a problem? Please describe.
I have a fixed set of options which are provided to the user.
The user may want to enter in an option which is not included in the set provided.
I have applied the tangible attribute.

If the enter in a custom option, once the option has been set, if they have made a spelling mistake, it is necessary for the user to retype the entire custom option again to fix the spelling error.

The previously typed option shows up as placeholder text, but cannot be edited.

Describe the solution you'd like
There should be an option which allows the user to click in the field and edit the text, deleting or adding characters without the need to retype a custom option.

This would only need to apply in the case where the multiple attribute was false to resolve my use case.

Describe alternatives you've considered

1. Not using vue-select and moving to a framework with the component I need.
2. Building my own component which does what I need.
3. Finding an alternative component to use.