romgrk

/*
 * BorrowMap: (possibly) zero-copy mutable data structure in a react context
 * =========================================================================
 *
 * The idea behind this concept is that we can have a mutable container in a
 * React-linked store but ONLY IF we never share a reference to the mutable
 * container itself. All the reads must be contained inside selectors. As long
 * as no one has a second reference to the mutable container, then we are sure
 * that no one is able to read/write it without us knowing.
 *