Release 3.0.0-beta.8

• remove unnecessary types (1dec6f6)
• add formal support for primitive wrappers (faeeb45)
• improve linting setup (7317d65)
• improve JSDoc for copiers (f594106)
• types and documentation cleanup (a4a8d67)
• lean into assign for runtime merging of options (f0cb431)
• make _keys and _values private and not part of expected Cache contract (f618a68)
• avoid local variable use (278edac)
• update README (c888b9d)