First stabilization milestone, stable numerics. Following semver rules after that for numerics and their public dependencies and related concepts.

• i8, i16, i32, i64, isize
• u8, u16, u32, u64, usize, uptr
• f32, f64
• FpCategory
• Eq, Ord, WeakOrd, PartialOrd
• Transmogrify for conversions with each other and with/between primitives (safer than static_cast!)
• Integer, Unsigned, Signed, UnsignedPrimitiveInteger, SignedPrimitiveInteger, PrimitiveInteger, Float, PrimitiveFloat
• Neg, BitAnd, Add, AddAssign, Sub, Mul, ... etc from num/num_concepts.h
• Option
• Result
• panic
• unsafe_fn
• Clone, Copy, Move concepts. clone(), move(), forward().
• Fn, FnMut, FnOnce

Some Option methods are unstable then still due to below:

• iter(), iter_mut(), into_iter(), from_iter() (re: Iterators)
• zip(), unzip() (re: Tuple)

Explicitly not included though:

• Iterators: https://github.com/chromium/subspace/milestone/2
• FromIterator, same deal.
• DynFn which can be its own milestone (along with Box?)
• mem::replace and friends. These are impl details for now.
• mem::relocate and friends. These are impl details for now.
• mem::take and friends. These are impl details for now.
• Tuple: Still baking.
• NeverValueField. Impl detail of Option for now.