In reply to dave_59:
Hi Dave ,
Shouldn’t the description/behavior match that of a mailbox new() with Negative Argument ?
i.e Combination of 2 and 3
LRM 15.4.1 :: The bound shall be positive. Negative bounds are illegal and can result in indeterminate behavior, but implementations can issue a warning.
All the licensed ones I observe use the default value of 0 for the mailbox ( i.e Unbounded )