`<<` inside comments turns into `<!`, making heredocs unusable inside `!program` commands

[Shell heredocs](https://en.wikipedia.org/wiki/Here_document) are this stuff:

    command << EOF
    multiple lines
	of input go here
	EOF

  Workaround: `cat 'stuff' |`.  [Useless Use Of Cat](http://porkmail.org/era/unix/award.html), but works.

Reported upstream https://github.com/inikulin/parse5/issues/325

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`<<` inside comments turns into `<!`, making heredocs unusable inside `!program` commands #4

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<< inside comments turns into <!, making heredocs unusable inside !program commands #4

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`<<` inside comments turns into `<!`, making heredocs unusable inside `!program` commands #4