Ship 2.1.2 with GC_HEAP_OLDOBJECT_LIMIT_FACTOR of 1.3
Many users are complaining about memory bloat in 2.1 series of Ruby
As denoted in https://bugs.ruby-lang.org/issues/9607 there is an excellent plan by ko1 to address this.
In the mean time I suggest we reduce GC_HEAP_OLDOBJECT_LIMIT_FACTOR to 1.3 which effectively means that instead of memory doubling it only increases by 1.5x or so over 2.0 series.
It is great we have the setting, but the reality is that most users will not want to play with this.