[feature request] how about modify the `table.unpack` function to make `table.unpack(table.pack(f()) === f()` equivalent

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Subject: [feature request] how about modify the `table.unpack` function to make `table.unpack(table.pack(f()) === f()` equivalent
From: 聂威 <davidxifeng@...>
Date: 2017年1月04日 12:24:53 +0800

dear list,

I have noticed that `table.unpack(list [,i [, j]])` will NOT regards the `n` field in the `list` table,

I know I can write it like this:

```

table.unpack(list, 1, list.n)

```

but will it be a good idea to make it read `n` field in table.unpack?

thanks and happy new year!

ps:

table.pack in Lua 5.3 manual:

```

`table.pack (···)`

Returns a new table with all parameters stored into keys 1, 2, etc. and with a field "n" with the total number of parameters. Note that the resulting table may not be a sequence.

```

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