src/main/java/org/apache/commons/text/StrBuilder.java [2356:2398]:
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    public String leftString(final int length) {
        if (length <= 0) {
            return StringUtils.EMPTY;
        }
        if (length >= size) {
            return new String(buffer, 0, size);
        }
        return new String(buffer, 0, length);
    }

    /**
     * Gets the length of the string builder.
     *
     * @return The length
     */
    @Override
    public int length() {
        return size;
    }

    /**
     * Extracts some characters from the middle of the string builder without throwing an exception.
     * <p>
     * This method extracts {@code length} characters from the builder at the specified index. If the index is negative it is treated as zero. If the index is
     * greater than the builder size, it is treated as the builder size. If the length is negative, the empty string is returned. If insufficient characters are
     * available in the builder, as much as possible is returned. Thus the returned string may be shorter than the length requested.
     * </p>
     *
     * @param index  the index to start at, negative means zero
     * @param length the number of characters to extract, negative returns empty string
     * @return The new string
     */
    public String midString(int index, final int length) {
        if (index < 0) {
            index = 0;
        }
        if (length <= 0 || index >= size) {
            return StringUtils.EMPTY;
        }
        if (size <= index + length) {
            return new String(buffer, index, size - index);
        }
        return new String(buffer, index, length);
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src/main/java/org/apache/commons/text/TextStringBuilder.java [2530:2573]:
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    public String leftString(final int length) {
        if (length <= 0) {
            return StringUtils.EMPTY;
        }
        if (length >= size) {
            return new String(buffer, 0, size);
        }
        return new String(buffer, 0, length);
    }

    /**
     * Gets the length of the string builder.
     *
     * @return The length
     */
    @Override
    public int length() {
        return size;
    }

    /**
     * Extracts some characters from the middle of the string builder without throwing an exception.
     * <p>
     * This method extracts {@code length} characters from the builder at the specified index. If the index is negative
     * it is treated as zero. If the index is greater than the builder size, it is treated as the builder size. If the
     * length is negative, the empty string is returned. If insufficient characters are available in the builder, as
     * much as possible is returned. Thus the returned string may be shorter than the length requested.
     * </p>
     *
     * @param index the index to start at, negative means zero
     * @param length the number of characters to extract, negative returns empty string
     * @return The new string
     */
    public String midString(int index, final int length) {
        if (index < 0) {
            index = 0;
        }
        if (length <= 0 || index >= size) {
            return StringUtils.EMPTY;
        }
        if (size <= index + length) {
            return new String(buffer, index, size - index);
        }
        return new String(buffer, index, length);
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