PASS Keypath - my.key 
PASS Keypath - my.køi 
PASS Keypath - my.key_ya 
PASS Keypath - public.key$ya 
PASS Keypath - true.$ 
PASS Keypath - my._ 
PASS Keypath - delete.a7 
PASS Keypath - p.p.p.p.p.p.p.p.p.p.p.p.p.p 
PASS Keypath - str.length 
PASS Keypath - arr.length 
PASS Keypath - length 
PASS Keypath - '' uses value as key 
PASS Keypath - [''] uses value as [key] 
PASS Keypath - ['x', 'y'] 
PASS Keypath - [['x'], 'y'] (stringifies) 
PASS Keypath - ['x', {toString->'y'}] (stringifies) 
PASS Keypath - name,type 
PASS Keypath - name,type.name 
PASS Keypath - array loop -> stringify becomes ['']