Type erasure Forcing all objects to be heap allocated which makes things like Optional introduce even more memory indirection because thrashing your cache is t

Type erasure Forcing all objects to be heap allocated which makes things like Optional introduce even more memory indirection because thrashing your cache is totally fine No primitives in generics which therefore means no primitives in containers Which then leads to the fun of autoboxing so that way your bools can be true, false, or null!