twig/intl-extra: Unbounded formatter memoisation in keyed on template-controlled arguments
IntlExtension memoises every \IntlDateFormatter and \NumberFormatter it creates in instance-level arrays keyed on a hash that includes locale, pattern, attrs and other values that are ordinary named arguments of the format_datetime / format_date / format_time / format_number / format_currency filters. There is no size limit and no eviction. A template that iterates over many distinct pattern (or locale, or grouping_used, …) values therefore allocates one ICU formatter object per distinct …