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https://issues.apache.org/jira/browse/NUMBERS-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17357261#comment-17357261
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Matt Juntunen commented on NUMBERS-161:
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commons-geometry builds with this so it's good from my perspective.
> PlaneAngle Numerical Accuracy
> -----------------------------
>
> Key: NUMBERS-161
> URL: https://issues.apache.org/jira/browse/NUMBERS-161
> Project: Commons Numbers
> Issue Type: Improvement
> Reporter: Matt Juntunen
> Assignee: Gilles Sadowski
> Priority: Major
>
> The current {{PlaneAngle}} class introduces unnecessary round-off errors
> during use since it internally converts all values to turns. For example, it
> is currently impossible to represent the radians value {{Double.MIN_NORMAL}}
> exactly since the internal multiplication introduces errors:
> {{PlaneAngle.ofRadians(Double.MIN_NORMAL).toRadians()}} does not equal
> {{Double.MIN_NORMAL}}. We should restructure this API so that values are
> stored exactly and multiplication is only performed when required.
> This issue was discovered during work on GEOMETRY-124. Use of the new
> {{Reduce}} class added two more floating point operations to angle
> normalization and caused a regression in commons-geometry-spherical.
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