asp.net core mvc 2.0 - Why does UseHosting not strongly type requirements? -

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i'm looking @ usestartup method in aspnetcore.hosting:

public static microsoft.aspnetcore.hosting.iwebhostbuilder usestartup<tstartup>(this microsoft.aspnetcore.hosting.iwebhostbuilder hostbuilder) aspnet hosting project.

the documentation here states: "the startup class must public , contain following methods:" 

public void configureservices(iservicecollection services) { }  public void configure(iapplicationbuilder app) { }

my question is, why isn't enforced in method signature usestartup? seems unusual me.





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