ebda6bf0c5
We now use a stack allocator when making a copy of current connection state at the start of the signal emission process, and when collecting results from signal handlers in the case of a non-void return type. These changes also include a functionally neutral reworking of how the connection state copy is made and then used to check that a connection/handler is still valid mid-emission. Heap allocation will still happen if a signal has more than (currently) 512 connections. A little experimentation reveals that the maximum number of connections is typically nroutes+1, so 512 seems like a reasonable choice for this.
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