Flags sets the flags based on package "os" flag values.

New is the constructor for Simple.

WithPearson will create a lookup cache using Pearson hashing to make lookups actually happen at O(1) (after the hash calc) instead of walking the file system tree after various strings splits.

FS provides a simple memory structure that implements io/fs.FS and fs.Writer(above).

WRFile provides an io.WriteCloser implementation.

SimpleOption provides an optional argument to NewSimple().