Installs or uninstalls a handler that is used to resolve attempts to access non-existent global variables.
Useful for implementing a REPL where unknown identifiers may be fetched lazily from a database.
The handler to install, or null to uninstall a previously installed handler.
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Installs or uninstalls a handler that is used to resolve attempts to access non-existent global variables.
Useful for implementing a REPL where unknown identifiers may be fetched lazily from a database.