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Are there any tricks to insert all the keys and values of one table into another?

For example:

t = {}
t.a = "a"
t.b = "b"
t.c = "c"

u = { unpack(t), d="d", e="e" }

I know you can't use unpack except on numbered index values.   Is my only choice a table.foreach with an insert of each value from `t' into `u'?

// Chris