https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120511
--- Comment #8 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Note that for *decimal* floating-point types, {0} should arguably not be
considered a universal zero initializer (it produces a DFP zero with quantum
exponent 0, whereas (positive) 0 with the least possible quantum exponent has a
representation with all bits 0 and is what results from {}).
