fix: Improve caching of dictionaries #5105
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This change reduces dictionary reload for long running processes.
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This change reduces dictionary reload for long running processes.
The dictionary loader uses a WeakMap to keep dictionaries. This is very effective for keeping the memory size down when using the command-line tool. But, it also throws out dictionaries too soon when the spell checker is used as part of a server. To address this, the dictionary loader keep the most recent 10-20 loaded dictionaries in memory.