Mutability

• let / const preserve TS meaning

• const does not imply deep readonly

• "as const" is deep readonly

• can take &exclusive only on managed types for const

• readonly, readonly modifier, readonly T

• &T default to mutable

• &readonly for explicit readonly

• Rust only has mutable vs immutable

• "third rung" on the mutability ladder

• overwrite stability

• we can now distinguish "readonly, non-exclusive", "mutable, non-exclusive", "mutable, exclusive"

• (what about data races..? lints / DST / ...)

• exclusive ownership

• worker-local, borrowing

• WithAccess

• PlaceOf

• AccessOf, Local, Shared, ...