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With inspiration from other libraries

There is a newer version: 2.12.15

package io.virtdata.libbasics.shared.from_double.to_other;

import io.virtdata.annotations.Categories;
import io.virtdata.annotations.Category;
import io.virtdata.annotations.ThreadSafeMapper;

import java.util.function.DoubleFunction;

@ThreadSafeMapper
@Categories(Category.nulls)
public class NullIfEq implements DoubleFunction {

    private final double compareto;

    public NullIfEq(double compareto) {
        this.compareto = compareto;
    }

    @Override
    public Double apply(double value) {
        if (value == compareto) return null;
        return value;
    }
}