Release 4.0.0-beta.0

• update scripts description in README (dd1a04d)
• clean up various aspects of infra (a2eef76)
• simplify strict cloning (b38ddbc)
• remove comment (69c6444)
• move to runtime access of Object.create (703d4e6)
• update README (6138a6e)
• remove legacy support for missing RegExp.flags (a7e3e1a)
• eliminate Symbol check for tags (ff89587)
• refactor to eliminate WeakMap test, and instead allow flexible options (74aaef7)
• drop support for when Symbol is not defined (11199d0)
• improve performance of strict copies (85b7ed6)
• update README for named import (e9a08c7)
• update benchmarks (7c5e0fa)
• rename to named import (d24fa13)
• fix blob test (eca307d)
• remove flow-typed support and npm ignore in favor of files declaration (cf64ec7)
• [Maintenance] Upgrade to Yarn 4 (#101) (0078ed5)
• update CHANGELOG (f1cc924)