-star and * extensions hide the format

[jeswr]

In this line

N3.js/src/N3Parser.js

Lines 20 to 21 in 520054a

	const format = (typeof options.format === 'string') ?
	options.format.match(/\w*$/)[0].toLowerCase() : '',

with a input format option of text/n3-star the format constant becomes star and for text/n3* the format constant becomes the empty string.

This means that we cannot currently rdf-star mode for parsing and specify the content type. In particular this means that there is no way of parsing "n3-star" without manually overriding _supportsRDFStar or _isN3 after construction.