properties - Polymer number property assignment changes value -


i have strange problem.

i implemented polymer element heating control , have property actual temperature.

the value of property 23.5 (float value).

when assign transfered 'correct' value property, value changed. show problem added console output:

temperature: 23 - states[id].val: 23.2 temperature type: number states[id].val type: number

as can see in output value rounded during assignment. don't use observers or modify value.

any ideas why value changed?

here's relevant part of polymer element: 

<dom-module id="hm-thermostat">   <link rel="import" type="css" href="./styles/materialdesignicons.css">   <template>     <style is="thermostatstyle">       ..     </style>       ..       <div class="data">         <div class="flex-display act-vert-align">           <div class="mdi mdi-thermometer mdi-24px margin-right"></div>           <div class="text-width" hidden$="{{small}}">aktuelle temperatur:</div>           <div class="actualtemp">{{temperature}}°c</div>         </div>       </div>   </template>    <script>     polymer({       is: 'hm-thermostat',       properties: {         ..         temperature: {           type: number         },         ..       },       ..       datacallback: function (states) {         (var id in states) {           if (id.indexof(this.deviceid) >= 0) {             switch (id) {               ..               case "hm-rpc.0." + this.deviceid + ".1.temperature":                 this.temperature = states[id].val;                 console.log("temperature: " + this.temperature + " - states[id].val: " + states[id].val);                 console.log("temperature type: " + typeof this.temperature + " states[id].val type: " + typeof states[id].val);                 break;               ..             }           } else {             ..           }         }       }      });   </script> </dom-module>


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