src/main/java/org/apache/commons/text/StrBuilder.java [1309:1321]:
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    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 [1388:1400]:
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    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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