"|" is not a keywords

[jianboy]

"|" is not a keywords.

microsoft/vscode#130229 (comment)

[geekley]

They would make much more sense as something like:
punctuation.definition.string.block-scalar.literal.yaml
punctuation.definition.string.modifier.chomping-indicator.yaml
punctuation.definition.string.modifier.indentation-indicator.yaml

[jianboy]

keyword is a word such as:

"function", "class", "def" and so on. To make the font more prominent, I made the following settings:

		"keywords": {
			"fontStyle": "italic"
		},

I don't think "|" is a keyword. it may lead to mistakes

[geekley]

To be fair, there are "operator keywords" (e.g. +=), but those should be under keyword.operator.
keyword.control should be used for control instructions like if for return try etc.

That | is very similar to the " ' string initiators IMO, though it's arguable since it does allow a line comment after it.