When reconciling an account (via Cash->Reconciliation) it is not possible to enter a negative amount beginning with a '-' sign.
This bug was introduced in v1.3.22 by revision 5079.
This revision intended to trap date values accidentally entered into an amount field, by catching the characters '-' or '/'. Unfortunately it also traps negative amounts.
The attached patch fixes this by refining the regex.
It also removes an unused dependency on Try::Tiny which was also introduced by revision 5079.