Implement nullability modification via schema builder #4657
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Refreshed version of #1327 by @wubzz
fixes #1218
Note that old solution of
table.string('checksum').nullable().alter();is not particularly flexible, because it attempts to switch type from itself to itself, which works by a happy accident in majority databases, but breaks for the others (such as CockroachDB). It was also quite different from how other schema operations worked.