• Review PDD 19 PIR for namespaces behavior
• Review PDD 21 Namespaces
• TT #389 - don't install subs with :method into NameSpaces
• Review src/global.c:
  • Too many lookup functions may return NULL, which is inappropriate when exposed to PIR
  • PMCNULL is more appropriate for "Element does not exist"; it's used elsewhere pervasively
  • Parrot_set_global(), for example, is unsafe, considering its signature
  • There's a mixture of internal and external APIs
  • We should create an api.c file for symbols, namespaces, whatever