I have a ng repeat with a ng class that doesn't apply the css class in the case where my css class has a hyphen in the name:
<li
  ng-repeat="item in items"
  ng-class="{'i-someclass' : item.Id > 10}">
  {{item .name}}
</li>
Am I doing anything wrong? If I change the css class name to isomeclass it works. AngularJS v1.0.7
For me, your code works as is.
Here is a plunker that demonstrates the code.
js:
var app = angular.module('myApp', []);
app.controller('Ctrl', function($scope) {
  $scope.items = [
    { Id: 1, name: "item1" },
    { Id: 10, name: "item1" },
    { Id: 11, name: "item1" }
    ];
  });
html:
<html ng-app="myApp">
  <head>
    <script data-require="angular.js@*" data-semver="1.2.4" src="http://code.angularjs.org/1.2.4/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>
  <body ng-controller="Ctrl">
    <h1>Hello Plunker!</h1>
    <ul>
      <li
        ng-repeat="item in items"
        ng-class="{'i-someclass' : item.Id > 10}">
        {{item .name}}
      </li>
    </ul>
  </body>
</html>
css:
.i-someclass {
  color: red;
}
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