wire format array contents

[Micah Nordland]

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The wire format spec includes an array type:
array

    Starts with 32-bit array size in bytes, followed by the array
contents verbatim, and finally padding to a 32-bit boundary.

What type are the contents? The protocol description only uses the
array type in one place, the wl_keyboard::enter event
(http://wayland.freedesktop.org/docs/html/protocol-spec-interface-wl_keyboard.html)
and simply specifies array as the argument type without specifying
what type of things the array contains.
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