Proposal: simplify TVP creation

The idea is to provide ability to auto-convert IEnumerable<POCO> to TVP (IEnumerable<SqlDataRecord>)
To simplify TVP creation i propose to provide ability to fetch and cache TVP metadata from DB.

declare @a dbo.table_type_name_here
select * from @a

this lightweight query will produce empty resultset, it's possible to cache and use this metadata (dataReader.GetSchemaTable) to create POCO->TVP mapping.

somehow:

CREATE TYPE [dbo].[arrayOf_int] AS TABLE([e] [int] NULL)

var builder = cnn.TvpBuilder("dbo.arrayOf_int") //<-fetch/cache metadata at this point
...
cnn.Query<int>("select * from @tvp",
    new {tvp=builder.make(Enumerable.Range(1,10).Select(e=>new{e}))}) //<- map at this point

No source files or tests are named. Start by locating Dapper's existing table-valued parameter handling and review how ADO.NET schema metadata can be obtained with GetSchemaTable; done would require an agreed API that caches TVP metadata and converts IEnumerable values for the demonstrated query pattern.