deprecate support for pg ranges with excluding beginnings.
The Ruby Range object does not support excluding beginnings. We currently support excluding beginnings for some subtypes using manually by incrementing them (now using the `#succ` method). This is approach is flawed as it's not equal to an excluding beginning. This commit deprecates the current support for excluding beginnings. It also raises an `ArgumentError` for subtypes that do not implement the `succ` method. This is a temporary solution to get rid of the broken state. We might still add complete support for excluding beginnings afterwards. (Probably with a new `PGRange` object, which acts like a `Range` but has excluding beginnings.
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