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String.prototype.substr() is deprecated (see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) so we replace it with the slice() method which works similarily but isn't deprecated. Signed-off-by: Tobias Speicher <rootcommander@gmail.com> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>