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The simplest route to sandboxing probably consists of:

1. Write a routine to do a recursive copy on tables. It probably needs to be
aware of table cycles but only if you care about exporting _G or the

2. Build a table containing just the items you want available.

3. After loading the string to execute, do a setfenv with a deep copy (1) of
the table created in (2).

Lazy versions of (1) based on proxy tables, but that has its own set of