Any can represent any kind of serializable value, (e.g. not a Function or Symbol).
It takes up 12 bytes of space aligned to 8 bytes. The structure looks like this:
|--------------------------------------------|
| Value or Pointer (Float64) |
|--------------------------------------------|
| Type Tag (Uint32) |
----------------------------------------------
If the value being stored can be represented in 8 bytes or less, it is stored inline, otherwise space is allocated for the value separately and a pointer is stored.