MemoryStore size/limit with collections about scrapbook HOT 2 CLOSED

Nice catch!
I fixed this, though slightly different than what you suggested: if new data is added to collections, it can also lead to evictions in the parent.
That is fair game, IMO: other cache backends will also evict whatever they deem necessary, regardless of whether it's in a parent or child (these collections are mostly artificial anyway, implemented via prefixing - they're not separate cache servers)
En plus: it's not about data persistence (especially not in a "memory store") - it's ok for data to fall out of cache (a cache eviction is just meant to prevent the app from blowing up if one attempts to store too much data)

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Awesome!

MatthiasMullie\Scrapbook\Adapters\Collections\MemoryStore also needs to extend flush()

der... was thinking that flush should also update $size... but nothing is actually immediately "evicted"...
related to #30

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