option: streamOnly
do not wrap mixin args with promises (cause they already resolved)
do not wrap keys in each with promises (cause they already resolved)
do not wrap $indent with promises (cause they are always resolved)
do not wrap expression without any processing with promises
Merge branch 'feature/optimize-mixin' into develop
fix interpolation with promises
ver 1.1.4
Merge branch 'release/1.1.4' into develop