I would love if there was an official reference listing features and backcompat alternatives. So far, I've only found these:

feature	first released	module	mincompat
fc	5.16	Unicode::CaseFold	5.8
defer	5.40	Feature::Compat::Defer	5.14
class	5.38	Feature::Compat::Class	5.18
try	5.34	Feature::Compat::Try	5.14
builtin	5.36	builtin::compat	5.8
builtin	5.36	builtins::compat	5.8

Can you think of any others?

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