Dual MIT/ASLv2 is how Rust achieves GPLv2 compatibility while requiring contributions to be under the superior (to MIT) ASLv2 language, too. ASLv2/GPLv2 dual wo

Dual MIT/ASLv2 is how Rust achieves GPLv2 compatibility while requiring contributions to be under the superior (to MIT) ASLv2 language, too. ASLv2/GPLv2 dual would achieve the GPLv2 compat goal without potential unintended other consequences arising from the MIT part. The old Mozilla tri-license had both LGPL and GPL to relieve recipients from following the (impractical) letter of LGPLv2.1 when choosing to do the LGPLv2.1 to GPLv2 step.