Lua 5.3 integer support

[Fsu0413]

Lua 5.3 added an integer type.
The original number type is now treated as real type.

e.g.:

// push the number to Lua, in variable x
lua_pushnumber(L, (lua_Number)24);

-- x always is type of number, in Lua 5.3 it is real type
-- 24 is type of integer in Lua 5.3, in Lua 5.2 it is type of number
if x == 24 then
    print("Yes!")
else
    print("No!")
end

outputs "No!". Because x is now 24.0, not 24.
In Lua 5.2 and earlier this program should output "Yes." because both x and 24 is type of number.

This change breaks a lot of programs including swig-lua interface.
We can't use Lua 5.3 or later before this pr got merged to swig.

[ojwb]

All the Lua tests are failing in CI with:

../../../../../Lib/lua/lua.swg:179: Error: Syntax error in input(1).

Please run the test suite locally (make check-lua-test-suite) to catch such errors before pushing. It'll save you a lot of time too.

[ojwb]

@Fsu0413 Did you see my comment above about this breaking the Lua testsuite?

[Fsu0413]

Sorry...I am not currently working on this issue.
Please wait until I found a way to solve it.

I'm closing this issue by now.