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In message <>, David Jones writes:
> In my lua 4.0 the following code crashes (with a floating point
> exception):
> a={}
> a[2^31+1]=1

Further investigation reveals that getn uses a similar conversion and
can crash in the same way.

(While I was looking at getn I noticed)
There is a bug in the documentation for getn.  The documentation says:

... the largest numerical index with a non-nil value in the table

but the following code prints 0:


So the documentation should say:

This number is the value of the table field n, if it has a numeric
value, or the largest positive numerical index with a non-nil value
in the table, or 0 if no such index exists.