function Mime() {
  this._types = Object.create(null);
  this._extensions = Object.create(null);
  for (var i = 0; i < arguments.length; i++) {
    this.define(arguments[i]);
  }
  this.define = this.define.bind(this);
  this.getType = this.getType.bind(this);
  this.getExtension = this.getExtension.bind(this);
}
@param typeMap [Object] Map of MIME type -> Array[extensions]
@param ...