Aside tag parsing crashes when creating a text range

[mcichecki]

I don't have a text to reproduce this issue but it seems like it's crashing for one of our users. We've been using the markdown library for almost a year now and it's the first time we noticed issue with it.

Thread #6: lowerBound
EXC_BREAKPOINT

+0xce56b4 SourceLocation. (Aside.swift:234)
+0xce56b4 Comparable. (<compiler-generated>:15)
+0xce56b4 Comparable. (<compiler-generated>)
+0xce56b4 closure in BlockQuote.parseAsideTag (Aside.swift:234)
+0xce4ff4 Optional.map<T> (RawMarkup.swift)
+0xce4ff4 BlockQuote.parseAsideTag (Aside.swift:231)
+0xce5734 Aside.init (Aside.swift:183)
+0xcaae7c AIBlock.init (AIBlock.swift:18) <- the last call from our code

AIBlock init:

public init?(blockQuote: BlockQuote?) {
    guard let blockQuote else { return nil }
    let aside = Aside(blockQuote)
    guard aside.isAI else { return nil }
    self.aside = aside
}

Looks like this line is causing a problem:

swift-markdown/Sources/Markdown/Interpretive Nodes/Aside.swift

Line 234 in 5d4f6b8

return newStart..<originalRange.upperBound

Is it related to these changes that were released in 0.6.0 version? #196