A property path that cannot be read yields null
Property paths trade diagnosis for calm: nothing raises, and a reader cannot tell a missing value from a stored one.
The rule
Normative: this is the rule
- Property-path evaluation never raises.
- A path that cannot be read yields null, which is indistinguishable from a path that reads a stored null.
Rule identifiers are permanent and are never renumbered. Each implementation publishes its own standing against these rules; this specification does not.spec 1.0-draft · LANG-8 · changed in spec 1.0