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debug.setuservalue
Philipp Janda edited this page Mar 16, 2015
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In Lua 5.2 you can set the uservalue of a userdata to nil or to a
table (Lua 5.3 also allows other values, but this is not supported by
the compatibility implementation). Lua 5.1 only allows tables as
environments for userdata, and the usual default values for a
userdata's environment is the globals table _G, or the package
table. Therefore, the compatibility implementataion of
debug.getuservalue translates _G and
package environments to nil uservalues. The compatibility
implementation of debug.setuservalue for Lua 5.1 does the same and
sets the environment of a userdata to _G if you try to set the
uservalue to nil.