Add support for string-keyed attrs in from functions
#7
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Add support for string-keyed
attrsinfromfunctionsSince we're using Ecto.Changeset.cast,
newalready supportedattrsbeing string-keyed as thecastfunction accepts either atom or string keyed maps and appropriately sets the struct fields.However, the original
fromfunction did a simpleMap.mergeof the givenattrs. This resulted in a mix-key map being given to thenewfunction.Alter the
fromfunction to cast attrs to get an atom-keyed map of attributes which then merged as normal with the originalbase_struct