[WIP] Allow underscores in varbinary literals #24776
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Varbinary literals ignore any whitespace within the string to increase readability. Numeric literals allow underscores as digit separators, and a developer may expect the same affordance when using varbinary.
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Description
Allow underscores in addition to whitespace within varbinary literals.
Additional context and related issues
This PR has #24774 as a dependency.
This change was a minor point in the discussion of #23682, but I thought it
would be a good starting point to me as a contributor.
Numeric literals allow underscores for readability, and a developer (like me)
may expect that varbinary literals would use the same pattern. This syntax is more
lenient than the one for numbers, ignoring any number of underscores (or whitespace)
in the string.
Release notes
( ) This is not user-visible or is docs only, and no release notes are required.
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(x) Release notes are required, with the following suggested text: