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Bug: Out of memory if reloading the page excessively #574

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Hi, i noticed after using this awesome library, that if you reload a webpage containing this library over and over again it will consume increasingly more RAM. I'd guess that there are some resources that aren't freed on page reload, i can reliably reproduce this behaviour on the official demo site (https://sql.js.org/examples/GUI/)
here is a screenshot of the chrome performance monitor
image

as you can see, each time i reload the page some memory is allocated in the js heap that isn't being freed afterwards. i am not really sure if this is more of a chrome type bug or a bug from webassembly. it's also possible i overread something in the documentation how to properly handle deallocation of each wasm instance...

i've hit tab out of memory exceptions multiple times while developing a page with this library, but i dont think this is a particular high priority issue as it only happens if you EXCESSIVELY reload a webpage. i'd still though i should report this

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