question: boolean approxEquals ( S2Cap other , double maxError ) { return ( axis . aequal ( other . axis , maxError ) && Math . abs ( height - other . height ) <= maxError ) || ( isEmpty ( ) && other . height <= maxError ) || ( other . isEmpty ( ) && height <= maxError ) || ( isFull ( ) && other . height >= 2 - maxError ) || ( other . isFull ( ) && height >= 2 - maxError ) ; }
target:  Return true if the cap axis and height differ by at most "max_error" from the given cap "other".