better validation error messages

[pipermerriam]

What was wrong?

When a validation error occurred, it would often have a cryptic message such as:

"Value 28 is not less than or equal to 0"

It was really difficult to divine where this message originated from and what it was validating.

How was it fixed?

All of the validate_x functions now accept an optional title parameter. When provided, the corresponding message would then look something like this

validate_lte(..., title="Block Number")

"Block Number 28 is not less than or equal to 0"

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