lambdas are faster than eval strings in :def functions

[lacygoill]

As the title suggests, lambdas are faster than eval strings inside a :def function. I think that's because they're compiled, while eval strings are not.

[lacygoill]

As a simple test, we can use this command to test how faster lambdas are compared to eval strings once they're compiled inside a :def function:

vim -es -Nu NONE -i NONE -U NONE -S <(cat <<'EOF'
    vim9script
    def Lambda()
        var time = reltime()
        range(999999)->map({_, v-> v + 1})
        setline(1, reltime(time)->reltimestr()->matchstr('.*\..\{,3}') .. ' seconds to run lambdas')
    enddef
    Lambda()
    def EvalString()
        var time = reltime()
        range(999999)->map('v:val + 1')
        setline(2, reltime(time)->reltimestr()->matchstr('.*\..\{,3}') .. ' seconds to run eval strings')
    enddef
    EvalString()
    :%p
    qa!
EOF
)