ToString( number ) & number.toString() not producing the same output

ToString( number ) & number.toString() not producing the same output.

<cfscript>
num = int(1.8);
sNum1 = toString( num );
sNum2 = num.toString();

writeoutput( sNum1 & "<br>" );
writeoutput( sNum2 & "<br>" );
</cfscript>

Not an answer, but just wrote and ran CFML code on my phone

https://www.trycf.com/gist/baa8f24126496dcd6fd1b5311820cfec/lucee5?theme=monokai

Filed a bug https://luceeserver.atlassian.net/browse/LDEV-2767