src/observations.js
function(source, expression, value) {
    return this.getExpression(expression, { isSetter: true }).call(source, value);
  }
function(source, expression, value) {
    return this.getExpression(expression, { isSetter: true }).call(source, value);
  }
function ( source , expression , value ) { return this . getExpression ( expression , { isSetter : true } ) . call ( source , value ) ; }
Sets the value on the expression in the given context object
@param {Object} context The context object the expression will be evaluated against
@param {String} expression The expression to set a value with
@param {mixed} value The value to set on the expression
@return {mixed} The result of the expression against the context
Sets the value on the expression in the given context object