Some cleanup and tests for Enum and constexpr strings.

Enum.h

@@ -19,7 +19,7 @@ static_assert( __cplusplus > 2020'99 );
 #include "ConstexprString.h"
 #include "meta.h"
 
-namespace Alepha::Hydrogen  ::detail:: Enum_m
+namespace Alepha::Hydrogen  ::detail::  Enum_m
 {
 	inline namespace exports {}
 
@@ -52,13 +52,6 @@ namespace Alepha::Hydrogen  ::detail:: Enum_m
 		}
 	}
 
-	template< auto value, auto ... >
-	constexpr decltype( auto )
-	get_first_enum_string()
-	{
-		return value;
-	}
-
 	template< ConstexprString s >
 	struct EnumValueString
 	{
@@ -121,8 +114,6 @@ namespace Alepha::Hydrogen  ::detail:: Enum_m
 
 	template< EnumValueString ... values >
 	class exports::Enum
-		//: private comparable
-		// Alepha::Hydrogen comparables work differently than the one-off Cavorite form.
 	{
 		private:
 			enum class StrictInteger : unsigned {};
@@ -197,8 +188,6 @@ namespace Alepha::Hydrogen  ::detail:: Enum_m
 
 			constexpr unsigned get_index() const { return static_cast< unsigned >( value ); }
 
-			constexpr auto equality_lens() const { return value; }
-
 			bool operator == ( const Enum & ) const= default;
 
 			friend std::ostream &