limit recipients number for 0.8 (discussion)

For 0.8, we plan to release the feature "multiple recipients". However, this feature introduces a possible bug (#281 (closed)). With max 40 inputs, the created transaction document may be too big if there are more than 15 outputs = 14 receivers + 1 backchange. This bug is not harmful, no money is sent when it happens.

max_outputs = 100 - 3 - 2 x SENDERS - 2 x MAX_OUTPUTS = 100-3-(2x1)-(2x40) = 15

Should we :

• leave this bug open (it never happened with the developpers funding account, which seems to be the only one exceeding the limit of 15)
• add a MAX_RECEIVERS = 14 limit, with an error message telling the user to spend the money with littler receivers list.

Since 0.8 is to be released in Debian repos, I would rather add the MAX_RECEIVERS limit to avoid this bug ; and go on fixing it on 0.8.x if we have time, or 0.9+ if not.