Invalid cast exception when using caching LastModified property

[kambg]

System.InvalidCastException: Unable to cast object of type 'SpiderService.Dto.Book' to type 'SpiderService.Dto.Books'.

at OpenRasta.Caching.Configuration.ResourceMapper`1.<>c__DisplayClass1.b__0(Object resource)
at OpenRasta.Caching.Pipeline.LastModifiedContributor.PostExecution(ICommunicationContext context)
at OpenRasta.Pipeline.PipelineRunner.ExecuteContributor(ICommunicationContext context, ContributorCall call)

This is happening when a given Handler is setup with more that one resources and endpoints.
Requests for /Book/WWW are handled but for /Books/ByCode/WWW throw above exception.

BookSearchHandler setup:

ResourceSpace.Has.ResourcesOfType()
.AtUri("/Books?codeLike={searchTerms}")
.And.AtUri("/Books/ByCode/{searchTerms}").Named("OpenSearch:Book search")
.HandledBy()
.TranscodedBy()
.Map().LastModified(x => new DateTimeOffset(DateTime.Now));

                    ResourceSpace.Has.ResourcesOfType<Book>() 
                            .AtUri("/Book/{bookCode}") 
                            .HandledBy<BookSearchHandler>() 
                            .TranscodedBy<HtmlCodec>() 
                            .Map<Book>().LastModified(x => new DateTimeOffset(DateTime.Now)); 

[serialseb]

I think the problem was that 0.1 was reading the lastmod from the resourcekey rather than for the response resource. This is being fixed in 0.2.