base64Decoded adds unexpected characters at end

[sudansh]

Given assert fails

assertEquals( "{"aud":"ae.rain.com","exp":1713261313,"iat":1713259513,"iss":"ae.rain.com","rain:jurisdiction":"uae","sub":"58490195-01b9-4dcf-ae28-ae0b20f8fbda"}", "eyJhdWQiOiJhZS5yYWluLmNvbSIsImV4cCI6MTcxMzI2MTMxMywiaWF0IjoxNzEzMjU5NTEzLCJpc3MiOiJhZS5yYWluLmNvbSIsInJhaW46anVyaXNkaWN0aW9uIjoidWFlIiwic3ViIjoiNTg0OTAxOTUtMDFiOS00ZGNmLWFlMjgtYWUwYjIwZjhmYmRhIn0".base64Decoded )