Add test for double Inf, -Inf, and NaN.
Add test for double Inf, -Inf, and NaN.

yiliaofan/igbinary,ZeusbaseWeb/igbinary,phadej/igbinary,nimishzynga/php-igbinary,phadej/igbinary,nimishzynga/php-igbinary,derickr/igbinary,Jan-E/igbinary,derickr/igbinary,Sean-Der/igbinary,Sean-Der/igbinary,Jan-E/igbinary,igbinary/igbinary7,igbinary/igbinary7,igbinary/igbinary7,Jan-E/igbinary,ZeusbaseWeb/igbinary,yiliaofan/igbinary,Jan-E/igbinary,derickr/igbinary,nimishzynga/php-igbinary,Sean-Der/igbinary,igbinary/igbinary7,phadej/igbinary,igbinary/igbinary7,yiliaofan/igbinary,Jan-E/igbinary,ZeusbaseWeb/igbinary,nimishzynga/php-igbinary