Invalid CSR when initialized from a decoded base64 string

[mkarklins]

require 'openssl'
require 'base64'

# Build the CSR
key = OpenSSL::PKey::RSA.new(1024)
request = OpenSSL::X509::Request.new
request.subject = OpenSSL::X509::Name.new([['CN', "common_name",  OpenSSL::ASN1::UTF8STRING]])
request.public_key = key.public_key
request.sign(key, OpenSSL::Digest::SHA1.new)

# One request is decoded from a `encode64` the other one is from `strict_encode64`
decoded = Base64.decode64(Base64.encode64(request.to_der))
strictly_decoded = Base64.decode64(Base64.strict_encode64(request.to_der))

# Both strings are decoded identically
decoded == strictly_decoded #=> true
# .. even on byte level
decoded.split(//) == strictly_decoded.split(//) #= true

OpenSSL::X509::Request.new(decoded) #=> OpenSSL::X509::RequestError: invalid certificate request data
OpenSSL::X509::Request.new(strictly_decoded) #=> #<OpenSSL::X509::Request:0x4f290f46>

Not sure if this is strictly jruby-openssl issue, but how is it possible that two equal strings produce different results?

Environment:
jruby-9.1.13.0
MacOS Sierra 10.12.6
OpenSSL 0.9.8zh 14 Jan 2016
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

[kares]

seems that JOSSL is trying to eat up more data than 'really' passed in (for decoded case) :

java.lang.IllegalArgumentException: failed to construct sequence from byte[]: Extra data detected in stream
	at org.bouncycastle.asn1.ASN1Sequence.getInstance(Unknown Source)
	at org.bouncycastle.asn1.pkcs.CertificationRequest.getInstance(Unknown Source)
	at org.jruby.ext.openssl.impl.PKCS10Request.<init>(PKCS10Request.java:108)
	at org.jruby.ext.openssl.X509Request.initialize(X509Request.java:111)