2.1.899 Part 1 Section 18.17.7.45, COMPLEX
a. The standard states that if real-number has the value 0 and imaginary-number has a non-zero value, the resulting string contains just the real number.
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In Office, if real-number has the value 0 and imaginary-number has a non-zero value, the resulting string contains just the imaginary-number and suffix.