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If speed is really a concern (seldomly it is, since most of the time is spent executing the programs in shells, not the scripting part) you can use Wren or LuaJIT, Wren is a faster language but it's not as compatible as Lua (it uses some tricks like NaN-tagging which needs IEEE 754 double precision floating point type, and it needs a C99 compiler which is, while still widely available, not present on every system unlike a C89 compiler) and LuaJIT is even less compatible (it's compatible with most major platforms, tho) but if you use its builtin FFI, you may even get more-than-C speeds! LuaJIT is also only Lua 5.1 compatible unfortunately.
If speed is really a concern (seldomly it is, since most of the time is spent executing the programs in shells, not the scripting part) you can use Wren or LuaJIT, Wren is a faster language but it's not as compatible as Lua (it uses some tricks like NaN-tagging which needs IEEE 754 double precision floating point type, and it needs a C99 compiler which is, while still widely available, not present on every system unlike a C89 compiler) and LuaJIT is even less compatible (it's compatible with most major platforms, tho) but if you use its builtin FFI, you may even get more-than-C speeds! LuaJIT is also only Lua 5.1 compatible unfortunately.