serial_type specifies a field that starts in bounds but is much too large
for the allocated buffer. Mostly harmless. The overread is unlikely to
go more than one or two bytes past the end of the buffer.
FossilOrigin-Name: e436b2f4e5c5e6b2f70e65332c0c7d618e2ef20a
to read a corrupt database where the header size varint on a record is larger
than the maximum 32-bit signed integer.
FossilOrigin-Name: c3baca99f4580652afb2c3f73036ab83796a1557
