The main reason is a bug in deserialization(KT-55357) that doesn't allow
to deserialize some binaries compiled with that feature enabled.
While we might fix it in 1.8.0, it doesn't help because previous
compilers, e.g. 1.7.0 still may break when using freshly recompiled
libraries.
Considering, that almost any meaningful fix might look unsafe for
the almost released 1.8.0, we can't enable the feature even in 1.9,
because 1.8.0 compilers wouldn't read those libraries anyway.
So, effectively this feature will be only enabled in K2.
^KT-55357 Related
^KT-36770 Related
Denis.Zharkov
d34bd2e8c0