src/main/java/org/apache/commons/text/StrBuilder.java [1292:1319]:
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        final String str = isEmpty() ? defaultIfEmpty : standard;
        if (str != null) {
            append(str);
        }
        return this;
    }

    /**
     * Appends current contents of this {@code StrBuilder} to the provided {@link Appendable}.
     * <p>
     * This method tries to avoid doing any extra copies of contents.
     * </p>
     *
     * @param appendable the appendable to append data to
     * @throws IOException if an I/O error occurs
     * @see #readFrom(Readable)
     */
    public void appendTo(final Appendable appendable) throws IOException {
        if (appendable instanceof Writer) {
            ((Writer) appendable).write(buffer, 0, size);
        } else if (appendable instanceof StringBuilder) {
            ((StringBuilder) appendable).append(buffer, 0, size);
        } else if (appendable instanceof StringBuffer) {
            ((StringBuffer) appendable).append(buffer, 0, size);
        } else if (appendable instanceof CharBuffer) {
            ((CharBuffer) appendable).put(buffer, 0, size);
        } else {
            appendable.append(this);
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src/main/java/org/apache/commons/text/TextStringBuilder.java [1371:1398]:
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        final String str = isEmpty() ? defaultIfEmpty : standard;
        if (str != null) {
            append(str);
        }
        return this;
    }

    /**
     * Appends current contents of this {@code StrBuilder} to the provided {@link Appendable}.
     * <p>
     * This method tries to avoid doing any extra copies of contents.
     * </p>
     *
     * @param appendable the appendable to append data to
     * @throws IOException if an I/O error occurs.
     * @see #readFrom(Readable)
     */
    public void appendTo(final Appendable appendable) throws IOException {
        if (appendable instanceof Writer) {
            ((Writer) appendable).write(buffer, 0, size);
        } else if (appendable instanceof StringBuilder) {
            ((StringBuilder) appendable).append(buffer, 0, size);
        } else if (appendable instanceof StringBuffer) {
            ((StringBuffer) appendable).append(buffer, 0, size);
        } else if (appendable instanceof CharBuffer) {
            ((CharBuffer) appendable).put(buffer, 0, size);
        } else {
            appendable.append(this);
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