Mixing of alpha and digits in a pre-release field

[epage]

What it does

Identify when a pre-release field has both alpha and digit characters

Advantage

Avoid users messing up sort order, e.g. https://www.reddit.com/r/rust/comments/1tqd97o/rust_1960_is_out/oogstw1/

Drawbacks

Maybe someone legitimately has a pre-release field like this?

Versions have already been released using this scheme. Care will be needed to make sure the ordering is correct if they adjust the syntax used

Example

version = "1.0.0-rc9"

Could be written as:

version = "1.0.0-rc.9"