Version 1.0.7

Version 1.0.6

Added fuzzing for extra testing.
Fixed an issue that could cause a segfault when using HopSlotMap::retain that had the same underlying cause as the fix in 1.0.4 but was missed.

Fixed an issue that could cause a segfault when using HopSlotMap::drain. All versions 0.3+ are affected, and thus yanked.

Fixed the new_key_type! macro, it assumed the Key trait was in scope.
Updated code base with more stringent (clippy) warnings, and many small code quality and documentation changes.
Documented the minimum required stable Rust version, which is 1.49.

Fixed an instance where an uninitialized [u32; N] was created. The uninitialized values were never read - the code always initialized them before reading - but simply having the variable be uninitialized (despite all bit patterns being valid) is technically undefined behavior.

Removed all Copy trait restrictions of value types stable Rust! There are no longer any restrictions on the types you can store in any of the slot maps. For that reason Slottable was deprecated as well.
no_std support was added, use it by opting out of the default feature std.
Added sm.get_disjoint_mut([k1, k2, ...]) which allows you to get mutable references from multiple disjoint keys at the same time. This requires min-const-generics to be stabilized, so until Rust 1.51 comes out this is only available on nightly by setting the unstable feature.
Added an Entry API to the secondary maps.
Added derive(Clone) for iterators where possible.
Replaced Into<KeyData> with Key::data().
SecondaryMap now uses minimal space overhead. Each slot now uses max(sizeof(T), 4) bytes.
Moved SlotMap to the basic module.

Massive rework, with a focus on secondary maps and custom keys to prevent cross-slotmap key usage.
Removed DenseSlotMap in favour of HopSlotMap as the latter performs better when secondary maps are in use.
Unfortunately due to the redesign the first slot in a slot map must now always be empty. This means some deserializations of slot maps serialized with a version before 0.3.0 can fail.
Added SecondaryMap and SparseSecondaryMap, which allows you to associate extra data with keys given by a slot map.
Added DefaultKey, custom key types, and support for them on all slot maps and secondary maps. You must now always specify the key type you're using with a slot map, so SlotMap<i32> would be SlotMap<DefaultKey, i32>. It is recommended to make a custom key type with new_key_type! for any slot map you create, as this entirely prevents using the wrong key on the wrong slot map.
KeyData now has as_ffi and from_ffi functions that convert the data that makes up a key to/from an u64. This allows you to use slot map keys as opaque handles in FFI code.

Fixed a potential uninitialized memory vulnerability. No uninitialized memory was read or used directly, but Rust's assumptions could lead to it. Yanked all previous versions as they were all vulnerable.
Made a Key member non-zero so that Option<Key> is optimized.

Start of version history.