src/main/java/org/apache/commons/text/TextStringBuilder.java [423:435]:
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    public TextStringBuilder append(final char[] chars) {
        if (chars == null) {
            return appendNull();
        }
        final int strLen = chars.length;
        if (strLen > 0) {
            final int len = length();
            ensureCapacity(len + strLen);
            System.arraycopy(chars, 0, buffer, len, strLen);
            size += strLen;
        }
        return this;
    }
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src/main/java/org/apache/commons/text/StrBuilder.java [356:368]:
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    public StrBuilder append(final char[] chars) {
        if (chars == null) {
            return appendNull();
        }
        final int strLen = chars.length;
        if (strLen > 0) {
            final int len = length();
            ensureCapacity(len + strLen);
            System.arraycopy(chars, 0, buffer, len, strLen);
            size += strLen;
        }
        return this;
    }
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