Fix delayed background de-duplication and deprecate deprecate-staleRefreshTimeout
#134
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Background refreshes are now de-duplicated as expected
By moving the timeout/sleep just before the potential heavy work happens in
getFreshValuedeprecate-staleRefreshTimeoutis deprecated as an option in favor of manually handling it likeAs discussed in Only one pending refresh on staleRefreshTimeoutΒ #132, this option was only added to stay 100% backwards compatible with the original implementation and now seems to be rather misleading.