Also known as xod/core/absolute.
#pragma XOD dirtieness disable
node {
    void evaluate(Context ctx) {
        auto x = getValue<input_IN>(ctx);
        emitValue<output_OUT>(ctx, x > 0 ? x : -x);
    }
}| IN | OUT | 
| 0 | 0 | 
| -1 | 1 | 
| -0.251 | 0.251 | 
| -0.9924 | 0.9924 | 
| -99999.999 | 99999.999 | 
| -27638.247 | 27638.247 | 
| NaN | NaN | 
| Inf | Inf | 
| +Inf | Inf | 
| -Inf | Inf |