Default Arguments

During a function declaration, parameters can now declare their own default value.

Example Code
pluto
local function write(text = "No text provided.")
    print(text)
end
write()         --> No text provided.
write("Hello!") --> Hello!

This code behaves identically.
pluto
local function write(text)
    if text == nil then
        text = "No text provided."
    end
    print(text)
end
write()         --> No text provided.
write("Hello!") --> Hello!