We need to remove the tear off objects for SVGAnimatedNumber like what was done for SVGAnimatedInteger in https://trac.webkit.org/changeset/243036>.
Created attachment 365419 [details] Patch
Created attachment 365421 [details] Patch for review
<rdar://problem/49087067>
Committed r243266: <https://trac.webkit.org/changeset/243266>