[wp-meta] [Making WordPress.org] #7900: Add `hash` as a required extension for 6.8

[Making WordPress.org]

#7900: Add `hash` as a required extension for 6.8
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 Reporter:  johnbillion   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:
Component:  API           |  Resolution:
 Keywords:                |
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Comment (by dd32):

 Definitely onboard with adding a `extensions_required` field, although
 generally core only ends up requiring extensions that are installed on
 near-100% of sites, with polyfills otherwise.

 Technically `pcre` is an extension, although I'm not sure if it can be
 disabled. It appears to be installed on 100% of sites though (Same as
 JSON). `hash` is on something like 99.99997% of sites, and `mysqli` that's
 on 99.998% of sites.

 That does make me question if the maintenance burden / minute extra
 bandwith / extra core logic is really worth it when it might ultimately
 only ever affect only a handful of sites. The core bootstrap / upgrade-
 prevention checks are probably enough.

 That might change if we ever move to require an extension that's installed
 on a smaller set of sites, for example, `zip` that's only on 92.5% of
 sites.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/7900#comment:3>
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