Chafetz Chayim Yomi has a double entry for Shevat and Iyar

[Elyahu41]

https://github.com/hebcal/hebcal-learning/blob/main/src/chofetzChaim.ts#L171

If you see here, the entry for 16 Shvat and 25 Iyar is the same in a leap year. Just Tishrei changes.

[mjradwin]

Thanks. The source of this comes from Hebcal user Zalman Berger. This requires some correspondence with him to understand better the source of the double-entry

hebcal/hebcal-go#4