clean up usage of len in float64(), keep it uint32 in both ifdefed cases
clean up usage of len in float64(), keep it uint32 in both ifdefed cases

Acidburn0zzz/polyfill-prototype-1,zliang7/polyfill-prototype-1,jing-bao/polyfill-prototype-1,jing-bao/polyfill-prototype-1,modulexcite/polyfill-prototype-1,davidluz/polyfill-prototype-1,modulexcite/polyfill-prototype-1,zliang7/polyfill-prototype-1,davidluz/polyfill-prototype-1,kripken/polyfill-prototype-1,eminemix/polyfill-prototype-1,davidluz/polyfill-prototype-1,Acidburn0zzz/polyfill-prototype-1,payeldillip/polyfill-prototype-1,WebAssembly/polyfill-prototype-1,ckknight/polyfill-prototype-1,Acidburn0zzz/polyfill-prototype-1,modulexcite/polyfill-prototype-1,modulexcite/polyfill-prototype-1,eminemix/polyfill-prototype-1,ckknight/polyfill-prototype-1,payeldillip/polyfill-prototype-1,WebAssembly/polyfill-prototype-1,davidluz/polyfill-prototype-1,payeldillip/polyfill-prototype-1,kripken/polyfill-prototype-1,davidluz/polyfill-prototype-1,ckknight/polyfill-prototype-1,jing-bao/polyfill-prototype-1,ckknight/polyfill-prototype-1,zliang7/polyfill-prototype-1,Acidburn0zzz/polyfill-prototype-1,WebAssembly/polyfill-prototype-1,Acidburn0zzz/polyfill-prototype-1,jing-bao/polyfill-prototype-1,WebAssembly/polyfill-prototype-1,kripken/polyfill-prototype-1,jing-bao/polyfill-prototype-1,payeldillip/polyfill-prototype-1,eminemix/polyfill-prototype-1,zliang7/polyfill-prototype-1,WebAssembly/polyfill-prototype-1,ckknight/polyfill-prototype-1,zliang7/polyfill-prototype-1,modulexcite/polyfill-prototype-1,kripken/polyfill-prototype-1,payeldillip/polyfill-prototype-1,eminemix/polyfill-prototype-1,kripken/polyfill-prototype-1,eminemix/polyfill-prototype-1