Blockquotes are awful in markdown, because they're semi optional in continuation lines.

There are three options i've considered:

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Option A: Blockquote at start of para, and on every continuation line.

> a
> > b
> c
d

This would parse ( [a] ([b]) [c] ) [d] (quotes in ()s, paras in []s)

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Option B: Blockquote at start of Para. No > on continuation lines.

> a
> > b
> c
d

This would parse ( [a] ([b]) [c d] ) (quotes in ()s, paras in []s)

This also works a little like a list does in CommonMark

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Option C: CommonMark Rules. Blockquote at start of para, optionally on continuation lines.

> a
> > b
> c
d

This would parse ( [a] ([b c d]) ) (quotes in ()s, paras in []s)

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I implemented B, but i'm tempted by A