gc – Garbage Collector
Functions
gc.enable() 
Enable automatic garbage collection.
gc.disable() 
Disable automatic garbage collection. Heap memory can still be allocated, and garbage collection can still be initiated manually using 
gc.collect() 
Run a garbage collection.
gc.mem_alloc() 
Return the number of bytes of heap RAM that are allocated.
gc.mem_free() 
Return the number of bytes of available heap RAM.