NewLRUEvictedCache returns a Cache that uses LRU eviction strategy.

NewRandomEvictedCache returns a Cache that uses random eviction strategy.

StaticSizeOfMap provides a best-effort estimate of number of bytes that a map takes in memory.

StaticSizeOfMapWithSize is a slightly more efficient version of StaticSizeOfMap for when the caller knows the static size of key and value without having to use `reflect`.

IntSize is the number of bytes an int or uint takes.

MB is a short cut for 1024 * 1024.

stolen from runtime/internal/sys.

Cache defines an interface for a cache that stores Measurable content.

Measurable is an interface for types whose size is measurable.