good first issue
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Description
ref https://github.com/FuelLabs/fuel-tx/pull/99#issuecomment-1084909047
Currently, ScriptExecutionResult only supports 3 variants (Success, Revert, Panic), which only require 2 bits to represent.
This leaves 62 bits unused in the canonical encoding, which could be used to pack extra additional metadata. This could be things like
- PanicReason when result is a panic
$pc- assuming it's safe to represent as 32bits, which is more than enough for the VM_MAX_MEMORY unless we decide to allow transactions to use 4gb of mem in the future.- the index of the resultant receipt in the set of receipts
- etc
It's impossible to fully represent all the data that's needed, so we'd have to come up with a transparent yet compact encoding of metadata useful for debugging.