return {
    name = "stix-two-math",
    version = "1.00",
    comment = "Goodies that complement stix two opentype.",
    author = "Hans Hagen & Mikael Sundqvist",
    copyright = "ConTeXt development team",
    mathematics = {
        alternates = {
            calligraphic = { feature = 'ss01', value = 1, comment = "Mathematical Alternative Calligraphic Characters" },
            italic       = { feature = 'ss02', value = 1, comment = "Mathematical Alternative Lowercase Italic" },
            barred       = { feature = 'ss03', value = 1, comment = "Mathematical Alternative Barred Characters" }, -- hbar, lambdabar etc
            primes       = { feature = 'ss04', value = 1, comment = "Mathematical Alternative Primes" },            -- larger/lower primes, minute etc
            arrow        = { feature = 'ss05', value = 1, comment = "Mathematical Alternative Smaller Arrows" },
            narrower     = { feature = 'ss06', value = 1, comment = "Mathematical Alternative Narrower Elements" }, -- narrower/shorter element etc
            small        = { feature = 'ss07', value = 1, comment = "Mathematical Alternative Smaller Operators" },
            upright      = { feature = 'ss08', value = 1, comment = "Mathematical Alternative Upright Symbols" },   -- upright integrals etc.
            negated      = { feature = 'ss09', value = 1, comment = "Mathematical Alternative Negated Symbols" },
            relation     = { feature = 'ss10', value = 1, comment = "Mathematical Alternative Relations" },
            negatedset   = { feature = 'ss09', value = 1, comment = "Mathematical Alternative Negated Set Symbols" },
         -- todo         = { feature = 'ss14', value = 1, comment = "" },
            circled      = { feature = 'ss16', value = 1, comment = "Mathematical Alternative Circled Operators" },
        },
        tweaks = {
            aftercopying = {
                {
                    tweak    = "version",
                    expected = "Version 2.12 b168",
                },
                {
                    tweak = "dimensions",
                    list  = {
                        -- nothing yet
                    },
                },
                {
                    tweak   = "fixprimes",
                    scale   = 0.7,
                    smaller = true,
                    factor  = 0.85,
                },
                {
                    tweak = "checkspacing",
                },
                {
                    tweak = "addscripts",
                },
            },
        },
    },
}