data
1. List
  1. Iter
  2. IterRef
2. Array
3. Map
  1. IterRef
  2. Iter
4. Set
  1. IterRef
  2. Iter
5. Heap
  1. Iter
6. Iterator
  1. Empty
  2. One
  3. FromNext
  4. Map
  5. Filter
  6. FilterMap
  7. Skip
  8. SkipWhile
  9. Take
  10. TakeWhile
  11. MapWhile
  12. Zip
  13. Flatten
  14. Concat
  15. Enumerate
  16. Inspect
  17. Collect
  18. Fused
debug
derive
1. Tuple
2. Object
3. Composite
4. Struct
5. Enum
6. Variant
logical
1. Bool
2. Option
3. Result
numeric
1. N32
2. N64
3. Nat
  1. div_rem
4. I32
5. Int
6. F32
  1. parse
  2. to_string
ops
1. arithmetic
  1. Add
  2. Sub
  3. Mul
  4. Pow
  5. Div
  6. Rem
  7. Pos
  8. Neg
2. bitwise
  1. BitAnd
  2. BitOr
  3. BitXor
  4. Shl
  5. Shr
  6. Not
3. comparison
  1. Eq
  2. Ord
  3. Lt
  4. Le
4. elementwise
  1. binary
  2. unary
    1. singleton
    2. tuple
5. flex
  1. Fork
  2. Drop
6. Range
  1. Bound
  2. Step
7. Concat
8. Cast
9. Fn
rng
1. Pcg32
unicode
1. Char
2. String
unsafe
IO
util
prelude

`#root::numeric::F32`

`parse` `root/numeric/F32/parse.vi`

fn parse(str: String) -> Option[F32];