commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToDoubleHashMap.java [405:430]:
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        boolean newMapping = true;
        if (index < 0) {
            index = changeIndexSign(index);
            previous = values[index];
            newMapping = false;
        }
        keys[index]   = key;
        states[index] = FULL;
        values[index] = value;
        if (newMapping) {
            ++size;
            if (shouldGrowTable()) {
                growTable();
            }
            ++count;
        }
        return previous;
    }

    /**
     * Grow the tables.
     */
    private void growTable() {

        final int oldLength      = states.length;
        final int[] oldKeys      = keys;
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToFieldHashMap.java [417:442]:
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        boolean newMapping = true;
        if (index < 0) {
            index = changeIndexSign(index);
            previous = values[index];
            newMapping = false;
        }
        keys[index]   = key;
        states[index] = FULL;
        values[index] = value;
        if (newMapping) {
            ++size;
            if (shouldGrowTable()) {
                growTable();
            }
            ++count;
        }
        return previous;
    }

    /**
     * Grow the tables.
     */
    private void growTable() {

        final int oldLength      = states.length;
        final int[] oldKeys      = keys;
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