I realize that JavaScript doesn't support 64-bit types. I'm thinking
that GWT could fake this out by using a pair of int values to
represent a long, and so on.
In the mean time, if you never need to do any mathematics on the
numbers client-side, you can just toss strings and back and forth, and
wrap them into BigDecimals serverside. If there is math involved,
well, you're screwed :/
if enough people star this report it may change the priority, or
someone outside Google could take a shot at an implementation, after
all GWT is an open source project.
-jason