https://bz.apache.org/bugzilla/show_bug.cgi?id=66189

--- Comment #6 from Matthew Heironimus <matt.heironi...@rgax.com> ---
It appears this change occurred in version 5.2.1 of the library:

Version  C1 Result           A2 Result
5.1.0    0.1977500000000001  1.2205000000000001
5.2.0    0.1977500000000001  1.2205000000000001
5.2.1    0.19774999999999987 1.2205
5.2.2    0.19774999999999987 1.2205

> You can alter your own code to round the numbers the level of precision you 
> need.

If the results are rounded to 4 decimal places as suggested, the resulting
answer is identical for A2, but different for C1:

Version  C1 Rounded Result   A2 Rounded Result
5.1.0    0.1978              1.2205
5.2.0    0.1978              1.2205
5.2.1    0.1977              1.2205
5.2.2    0.1977              1.2205

Depending on how this value is used, this could be a significant difference.

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