403 request signature does not match errors with 1.5.0 about nodejs-storage HOT 4 CLOSED

var storage = require('@google-cloud/storage');
var path = require('path');
var gcs = storage({
    projectId: "test",
    keyFilename: path.join(__dirname, "key.json")
});

var options = {
    'key': "1.key",
    equals: [['$Content-Type', 'application/pdf'], ['$success_action_status','200']],
    successStatus: '200',
    expires: '2018-12-01T06:31:42.096Z',
    contentLengthRange: {
        min: 0,
        max: 20000000
    },
};
var file = gcs.bucket("test").file("1.key");
file.getSignedPolicy(options).then(function(val){
    console.log(val);
});

[~/projects/bug] npm install @google-cloud/[email protected]
+ @google-cloud/[email protected]
added 1 package and updated 1 package in 3.088s
[~/projects/bug] node test.js 
[ { string: '{"expiration":"2018-12-01T06:31:42.096Z","conditions":[["eq","$key","1.key"],{"bucket":"test"},["eq","$Content-Type","application/pdf"],["eq","$success_action_status","200"],{"success_action_status":"200"},["content-length-range",0,20000000]]}',
    base64: 'eyJleHBpcmF0aW9uIjoiMjAxOC0xMi0wMVQwNjozMTo0Mi4wOTZaIiwiY29uZGl0aW9ucyI6W1siZXEiLCIka2V5IiwiMS5rZXkiXSx7ImJ1Y2tldCI6InRlc3QifSxbImVxIiwiJENvbnRlbnQtVHlwZSIsImFwcGxpY2F0aW9uL3BkZiJdLFsiZXEiLCIkc3VjY2Vzc19hY3Rpb25fc3RhdHVzIiwiMjAwIl0seyJzdWNjZXNzX2FjdGlvbl9zdGF0dXMiOiIyMDAifSxbImNvbnRlbnQtbGVuZ3RoLXJhbmdlIiwwLDIwMDAwMDAwXV19',
    signature: 'fdjZmFVMjqptIC9k4RFQdsijia8agVZYELpUtr7WCxxaxXzJvSrp/w+ECU7Kke9+Y/W5TxbB/ybhjZPrmA7g0m1WVVh5z+KYixz1CPs7P1ESKVuoH86FSXntYkqIoKgH8b3WKpFGkez9nI1ZYOV7oIvHpYWtFvvkkr61Pk1P/PTD5wXIUF+edWRtYbp0oA7xkhxzldMDk2xy6EkCF8obdqL/utrBi8V9yD2M56uOAhZah/R03ybJqMFxwWlZhM/0Usiq7qbp6lH8AfHYRktYcAtvl84ssgUuEzxSL0dOWj6LNalmFjSpN6TBd8It+Ma7ohqSQZZ2C0TQ9J7Yo7fzqg==' } ]
[~/projects/bug] npm install @google-cloud/[email protected]
+ @google-cloud/[email protected]
added 5 packages and updated 1 package in 4.706s
[~/projects/bug] node test.js 
[ { string: '{"expiration":"2018-12-01T06:31:42.096Z","conditions":[["eq","$key","1.key"],{"bucket":"test"},["eq","$Content-Type","application/pdf"],["eq","$success_action_status","200"],{"success_action_status":"200"},["content-length-range",0,20000000]]}',
    base64: 'eyJleHBpcmF0aW9uIjoiMjAxOC0xMi0wMVQwNjozMTo0Mi4wOTZaIiwiY29uZGl0aW9ucyI6W1siZXEiLCIka2V5IiwiMS5rZXkiXSx7ImJ1Y2tldCI6InRlc3QifSxbImVxIiwiJENvbnRlbnQtVHlwZSIsImFwcGxpY2F0aW9uL3BkZiJdLFsiZXEiLCIkc3VjY2Vzc19hY3Rpb25fc3RhdHVzIiwiMjAwIl0seyJzdWNjZXNzX2FjdGlvbl9zdGF0dXMiOiIyMDAifSxbImNvbnRlbnQtbGVuZ3RoLXJhbmdlIiwwLDIwMDAwMDAwXV19',
    signature: 'hz/C3zdCAQfAJYCsPJ/7mC9R3PwBIDXHv7N6+eTDPNBKrdri8d89aU/Pt6DDaMhkiXgjnGx4BNLKGj6//Zrkv1vLg0PYKIky4r9u7XS6Pg+NnY2TzShmZVzuJ4sCyzcEZeJTKKIWrn1BgQJvrzeDs0ZXghJBEpknO4dMjrzkl7Op6LS/Prl1Cmv9xZ7GDY4EHleq210UR16E1s4PWWhGwAwuJT6FTJM21zQPrgb+BhAJvq8iDOcPS0Cc4HFER7slkyCB847FyezDEEP4/x2H9XoHguFZuuUDBs3IjwAvpQbIOqU2qEUvGYB4KL8XuKk+tB78pQuulrWl3F/CySyGlw==' } ]