It is used to work around a bug in Safari versions prior to 5.1.4.

Lines 1184 to 1194 in 552b2f4

    
           var ua = (navigator.userAgent || '').toLowerCase() 
        
             , parsed = ua.match(/.+(?:rv|it|ra|ie)[/: ](\d+)\.(\d+)(?:\.(\d+))?/) || [] 
        
             , version = +[parsed[1], parsed[2]].join('.'); 
        
           if ( 
        
                !~ua.indexOf('chrome') 
        
             && ~ua.indexOf('safari') 
        
             && version < 534.54 
        
           ) { 
        
             Primus.prototype.AVOID_WEBSOCKETS = true; 
        
           }

navigator.userAgentData is not even supported by Safari 16.

I think no one is using a version of Safari earlier than 5.1.4 nowadays and I don't even know if Primus still works there so I think it might make more sense to remove the workaround completely.

	var ua = (navigator.userAgent \|\| '').toLowerCase()
	, parsed = ua.match(/.+(?:rv\|it\|ra\|ie)[/: ](\d+)\.(\d+)(?:\.(\d+))?/) \|\| []
	, version = +[parsed[1], parsed[2]].join('.');

	if (
	!~ua.indexOf('chrome')
	&& ~ua.indexOf('safari')
	&& version < 534.54
	) {
	Primus.prototype.AVOID_WEBSOCKETS = true;
	}

Consider alternative to deprecated navigator.userAgent getter. #780

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