function compatibleInstance(thrown, errorLike) {
  return errorLike instanceof Error && thrown === errorLike;
}
### .compatibleInstance(thrown, errorLike)

Checks if two instances are compatible (strict equal).
Returns false if errorLike is not an instance of Error, because instances
can only be compatible if they're both error instances.

@name compatibleInstance
@param {Error} thrown error
@param {Error|ErrorConstructor} errorLike object to compare against
@namespace Utils
@api public