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Operations on numbers follow the same rules of the underlying C implementation, which, in turn, usually follows the IEEE 754 standard.
(It is easy to build Lua interpreters that use other internal representations for numbers, such as single-precision floats or long integers; see file is provided to allow arbitrary C data to be stored in Lua variables.
Userdata values cannot be created or modified in Lua, only through the C API.
This guarantees the integrity of data owned by the host program.
The language supports this representation by providing , which is called the length of the sequence (see §3.4.6).
Like indices, the values of table fields can be of any type.
Through the use of C functions, Lua can be augmented to cope with a wide range of different domains, thus creating customized programming languages sharing a syntactical framework.
Previously loaded chunks are not affected, however, as each has its own reference to the environment in its (which is stored in the original global environment) is never updated by Lua.
Because Lua is an embedded extension language, all Lua actions start from C code in the host program calling a function from the Lua library (see ).
Whenever an error occurs during the compilation or execution of a Lua chunk, control returns to the host, which can take appropriate measures (such as printing an error message).
Lua code can explicitly generate an error by calling the ) is propagated with information about the error.
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The Lua distribution includes a sample host program called , which uses the Lua library to offer a complete, standalone Lua interpreter, for interactive or batch use.