Base64.getMimeDecoder().decode() throws IAE for a non-base64 character after padding

Mime decoder does not ignore non-Base64 chars that appear after padding ('=')

import java.util.Base64;

public class CharToIgnoreAtTheEnd {

    public static void main(String[] args) {
        Base64.getMimeDecoder().decode("bGVhc3VyZS4=$");
    }
}

The output is

Exception in thread "main" java.lang.IllegalArgumentException: Input byte array has wrong 4-byte ending unit
at java.util.Base64$Decoder.decode0(Base64.java:1080)
at java.util.Base64$Decoder.decode(Base64.java:686)
at java.util.Base64$Decoder.decode(Base64.java:709)
at CharToIgnoreAtTheEnd.main(CharToIgnoreAtTheEnd.java:6)


The following JCK tests will fail due to this issue:

api/java_util/Base64/Decoder/index.html#MimeDec_NonBase64CharsIgnored[validInput_ignoredCharAtTheEnd]
api/java_util/Base64/Decoder/index.html#MimeDec_NonBase64CharsIgnored[lineSeparatorInTheEnd]
api/java_util/Base64/index.html#Samples[phrase_01_decodeToByteArray]