message: Safe minify
  disable simplifyComparisons babel plugin in babili to allow complex bound properties to be properly computed
diff: @@ -108,7 +108,7 @@ class JSBabelTransform extends GenericOptimizeTransform {
  }
  /**
  - * A convinient stream that wraps JSBabelTransform in our default "compile"
  + * A convenient stream that wraps JSBabelTransform in our default "compile"
  * options.
  */
  export class JSDefaultCompileTransform extends JSBabelTransform {
  @@ -118,13 +118,14 @@ export class JSDefaultCompileTransform extends JSBabelTransform {
  }
  /**
  - * A convinient stream that wraps JSBabelTransform in our default "minify"
  + * A convenient stream that wraps JSBabelTransform in our default "minify"
  * options. Yes, it's strange to use babel for minification, but our minifier
  * babili is actually just a plugin for babel.
  + * simplyComparisons plugin is disabled (https://github.com/Polymer/polymer-cli/issues/689)
  */
  export class JSDefaultMinifyTransform extends JSBabelTransform {
  constructor() {
  - super({presets: [babiliPreset]});
  + super({presets: [babiliPreset(null, {'unsafe': {'simplifyComparisons': false }})]});
  }
  }
  