json context manager

[dagraham]

I've tried subclassing both Storage and JSONStorage and replacing their read and write methods with ones that use context management but it seems that neither are being actually used even though the subclassed storage classes seem to be loaded. Where am I going wrong? Help please.

I'm trying this because of an endless stream of:
Exception ignored in: <_io.FileIO name='/Users/dag/etm-test/etm.json' mode='rb+' closefd=True>
ResourceWarning: unclosed file <_io.TextIOWrapper name='/Users/dag/etm-test/etm.json' mode='r+' encoding='UTF-8'>