file patterns for argument list

Today I discovered that this works to add both file.h and file.cpp to the arg list:

  :args file.*{cpp,h}

But this doesn't work:

  :args file.{cpp,h}

The second variant just adds the (non-existent) "file.{cpp,h}" file name (with a literal "{h,cpp}" in the name) to the arg list.

Why?

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