Add support for acceptsUndefined: false to safe references #109
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MST proper supports an
acceptsUndefined: false
on safe references that automatically prunes invalid references from parent maps and arrays. I wanna use it in Gadget but noticed that it no worky -- we pass the option through to observable instances fine but didn't do anything with it in readonly instances. This adds handling for the special case, which requires arrays and maps to look at the child type, and if it is a safe reference with the option set, omit unresolved entries from the result. Woop woop.