Checks if a feature is enabled.
PumpkinDB is new and many (experimental) features are being hashed out. Instead of these features sitting in their own branches or Pull Requests, we decided to encourage broader experimentation.
FEATURE? will push
1 if feature
name is enabled,
PumpkinDB> "scoped_dictionary" FEATURE? 1 PumpkinDB> "unknown_feature" FEATURE? 0
EmptyStack error if there is less than one item on the stack
empty_stack : [FEATURE?] TRY UNWRAP 0x04 EQUAL?.