Debounce: make it possible to inmediately return the initial value

[BoussonKarel]

Use case:

• You have a computed property, for instance a query, which gets updated by some filters in your UI.
• The initial debouncedQuery should be set to the value of query, and updates after that should be debounced by x ms

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Latest commit: 42673f5f0b1e62bc10b8b906461faea57759dae9

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[NullVoxPopuli]

any chance you can rebase? just merged something that'll fix parts of CI