src/main/java/org/apache/commons/text/StrBuilder.java [1766:1784]:
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    public boolean equals(final StrBuilder other) {
        if (this == other) {
            return true;
        }
        if (other == null) {
            return false;
        }
        if (this.size != other.size) {
            return false;
        }
        final char[] thisBuf = this.buffer;
        final char[] otherBuf = other.buffer;
        for (int i = size - 1; i >= 0; i--) {
            if (thisBuf[i] != otherBuf[i]) {
                return false;
            }
        }
        return true;
    }
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src/main/java/org/apache/commons/text/TextStringBuilder.java [1921:1941]:
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    public boolean equals(final TextStringBuilder other) {
        if (this == other) {
            return true;
        }
        if (other == null) {
            return false;
        }
        if (this.size != other.size) {
            return false;
        }
        // Be aware not to use Arrays.equals(buffer, other.buffer) for equals() method
        // as length of the buffers may be different (TEXT-211)
        final char[] thisBuf = this.buffer;
        final char[] otherBuf = other.buffer;
        for (int i = size - 1; i >= 0; i--) {
            if (thisBuf[i] != otherBuf[i]) {
                return false;
            }
        }
        return true;
    }
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