[zgrssd]

The above code (after adding some missing = in the table assignment at the botom) has been uploaded as version 0.2.
I also started work on a function that gives you a value indexed array of the keys. This is my code so far (not done any testruns):

function lib:getValIndexedKeyList(input)
    --assert that input is remotely valid
    assert (input ~= nil and type(input) == "table", "input must be not nil and a table")
    
    local result = {}
    
    for outerkey, outervalue in input do
        --assert that this index of input has the right contained elements
        assert (type(outervalue) == "table" and outervalue.key ~= nil and outervalue.value ~= nil, "Key: '" .. outerkey .. "' is not a table or does not contain a pair of key/value indexes")
        
        --Some local variables to shorten the syntax
        local innerkey, innervalue = outervalue.key, outervalue.value
        
        --Check if this value has already been used as key
        assert(result[innervalue] == nil, "Key: '" .. outerkey .. "' contains the duplicate value '" .. innervalue .. "'")
        result[innervalue] = innerkey
    end
    
    return result
end