The current version of metalua is 0.4 alpha. Although API tend to become more stable as versions are released, there's no guarantee for stability nor backward compatibility until version 1.0 is reach, except that compatibility with Lua 5.1 will be kept.
A note about alpha, beta etc.
I'm sometimes surprized by the sense people attach to the alpha and beta qualifiers for software. My definition, applicable to metalua, is that:
- alpha quality software is not feature full, and there's no guarantee about backward compatibility across alpha versions
- beta quality software has its definitive, complete API, but hasn't gone through enough testing to be considered reliable