futureverse / futureverse/future

Deprecate support for persistent=TRUE in cluster futures

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feature/sticky-globals
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Description

# Background

See https://github.com/HenrikBengtsson/future/issues/382. This is specifically for `cluster` futures, which is the only remaining class of futures where `persistent` may be used.

# Roadmap

* [ ] Provide a convenient mechanism for "sticky" globals, cf. https://github.com/HenrikBengtsson/future/issues/382#issuecomment-659544519

* [ ] Give people time to adopt sticky globals

* [ ] Formally deprecate `persistent=TRUE` with a warning message that refers to instructions on how to use sticky globals.

PS. Should "sticky globals" simply be called "persistent globals"?

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