Some unsafe characters (curly brackets) do not get url encoded

[pabo]

expected behavior: { and } are encoded as %7B and %7D
actual behavior: { and } are not encoded at all and are included raw.

Example:

This file is already encoded and has style rules that includes { (%7B):

$ cat test.css 

#div {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' version='1.1' class='checkmark' x='0' y='0' width='23.3' height='23.3' viewBox='0 0 23.3 23.3' xml:space='preserve' enable-background='new 0 0 23.3 23.3'%3E
%3Cstyle type='text/css'%3E.rtp0%7Bfill:%230382C1;%7D.rtp1%7Bfill:%23FFFFFF;%7D%3C/style%3E
%3Cpath class='rtp0' d='M23.3 11.7C23.3 5.2 18.1 0 11.7 0S0 5.2 0 11.7s5.2 11.7 11.7 11.7S23.3 18.1 23.3 11.7'/%3E%3Cpath class='rtp1' d='M11 16.2c-0.2 0.2-0.4 0.2-0.6 0L10 15.9l0 0 -4-3.7 1.6-1.8 3 2.8L16.4 7l1.7 1.7L11 16.2z'/%3E%3C/svg%3E");
}

running cssnano with svgo enabled, the { character gets decoded from %7B

$ node_modules/.bin/cssnano  test.css

#div{background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' class='checkmark' width='23.3' height='23.3' viewBox='0 0 23.3 23.3'%3E
%3Cstyle%3E.rtp0{fill:%230382c1}.rtp1{fill:%23fff}%3C/style%3E
%3Cpath class='rtp0' d='M23.3 11.7C23.3 5.2 18.1 0 11.7 0S0 5.2 0 11.7s5.2 11.7 11.7 11.7 11.6-5.3 11.6-11.7'/%3E%3Cpath class='rtp1' d='M11 16.2c-.2.2-.4.2-.6 0l-.4-.3-4-3.7 1.6-1.8 3 2.8L16.4 7l1.7 1.7-7.1 7.5z'/%3E%3C/svg%3E")}

but disabling svgo, the { character stays encoded, as it should

$ node_modules/.bin/cssnano --no-svgo  test.css

#div{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' version='1.1' class='checkmark' x='0' y='0' width='23.3' height='23.3' viewBox='0 0 23.3 23.3' xml:space='preserve' enable-background='new 0 0 23.3 23.3'%3E
%3Cstyle type='text/css'%3E.rtp0%7Bfill:%230382C1;%7D.rtp1%7Bfill:%23FFFFFF;%7D%3C/style%3E
%3Cpath class='rtp0' d='M23.3 11.7C23.3 5.2 18.1 0 11.7 0S0 5.2 0 11.7s5.2 11.7 11.7 11.7S23.3 18.1 23.3 11.7'/%3E%3Cpath class='rtp1' d='M11 16.2c-0.2 0.2-0.4 0.2-0.6 0L10 15.9l0 0 -4-3.7 1.6-1.8 3 2.8L16.4 7l1.7 1.7L11 16.2z'/%3E%3C/svg%3E")}

[strarsis]

Could this module be useful for safe url-escaping?: inline-urlescape