Prerelease behavior between ports is inconsistent

[unascribed]

Ref #10 — there is an ambiguity in the specification that resulted in the Go implementation differing from all the others.

Go separately splits on hyphens, where all the other implementations look for existing textual components that begin with -.

The spec should be updated to require that - and + be separate special split characters, and all non-Go implementations updated to match.

Waiting for #10 before I make this change, as it touches most implementations. #10 has been merged.

Port progress:

• [x] Java
• [x] JavaScript
• [x] Rust #13
• [x] D
• [x] Crystal #9
• [x] Python #11
• [x] Go (unaffected)