• fix: each cached format keeps at most 1000 formatters, dropping the oldest when full. This covers the built-in formats (number, currency, datetime, relativetime, list) with the default cacheInBuiltFormats: true, and formats added with addCached. The cache key holds all t() options, including the interpolated values, so every new amount, date or name added a formatter that was never released: about 50 MB per 100k values, growing without end in a long-running server. A dropped formatter is made again from the same language and options, so the output does not change. Thanks @liustack (#2467).