Commit877067c

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Add note to longintrepr.h to clarify that ob_digit[0] is always safe to access.

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Original file line number	Diff line number	Diff line change
`@@ -71,6 +71,9 @@ typedef long stwodigits; /* signed variant of twodigits */`
`71`	`71`	`0 <= ob_digit[i] <= MASK.`
`72`	`72`	`The allocation function takes care of allocating extra memory`
`73`	`73`	`so that ob_digit[0] ... ob_digit[abs(ob_size)-1] are actually available.`
	`74`	`+ We always allocate memory for at least one digit, so accessing ob_digit[0]`
	`75`	`+ is always safe. However, in the case ob_size == 0, the contents of`
	`76`	`+ ob_digit[0] may be undefined.`
`74`	`77`
`75`	`78`	`CAUTION: Generic code manipulating subtypes of PyVarObject has to`
`76`	`79`	`aware that ints abuse ob_size's sign bit.`

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