[OpenLayers-Dev] grid layout calculation magic or something like that

[BrainDrain]

Hi. 
I'm trying to enable client browser caching for my app via constant url's to
mapserver tiles. 
For certain mapserver state (state => hash key as url parameter - crc32 of
config/SLD), using some custom url schema (instead of mapserv cgi parameters
schema) and my http handler, I can achieve that. 
But as I can see OL.layer.mapserver mapext, imgext url parameters are
slightly (in my case 11-12 sign) different from time to time (from one web
app initializing to another). How can I fix that? I suppose the problem is
in initGriddedTiles method ('heaven help us' in comments!)))) or in
calculateGridLayout. May be this is related to rounding. Unfortunately I
haven't time to dig into the code and currently I'm using temp solution: 
(function() { 
OpenLayers.Layer.MapServer.prototype.getURL = function(bounds) { 
                bounds = this.adjustBounds(bounds); 
                         
//--------------------------------------------------------------------------------- 
                          var extent = [parseFloat(bounds.left.toFixed(10)),
parseFloat(bounds.bottom.toFixed(10)), parseFloat(bounds.right.toFixed(10)),
parseFloat(bounds.top.toFixed(10))]; 

                         
//--------------------------------------------------------------------------------- 
                
                          var imageSize = this.getImageSize(); 
                return this.getFullRequestString({ 
                        mapext: extent, 
                        imgext: extent, 
                        map_size: [imageSize.w, imageSize.h], 
                        imgx: imageSize.w / 2, 
                        imgy: imageSize.h / 2, 
                        imgxy: [imageSize.w, imageSize.h] 
                });; 
        }; 
})();

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