update Rational with changes to SafeLong/spire.math
update Rational with changes to SafeLong/spire.math

non/spire,tixxit/spire,JackSullivan/spire,guersam/spire,siddhartha-gadgil/spire,kevinmeredith/spire,non/spire,JackSullivan/spire,siddhartha-gadgil/spire,adampingel/spire,tixxit/spire,kevinmeredith/spire,AlecZorab/spire,codeaudit/spire,rklaehn/spire,woparry/spire,woparry/spire,adampingel/spire,AlecZorab/spire,guersam/spire,codeaudit/spire,rklaehn/spire