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libcbor-ruby's Issues

`CBOR.decode("\xC6`".b)` raises `CBOR::DecodingError`

Hi,

Apparently I can decode tags 0 to 5, but starting from 6 it returns CBOR::DecodingError. Is this expected?

$ irb
irb(main):001:0> require "libcbor/all"
~/.gem/ruby/2.6.5/gems/libcbor-0.1.0/lib/libcbor.rb:50: warning: constant ::Fixnum is deprecated
=> true
irb(main):002:0> CBOR.decode(CBOR.encode(CBOR::Tag.new(0, "")))
=> #<struct CBOR::Tag value=0, item="">
irb(main):003:0> CBOR.decode(CBOR.encode(CBOR::Tag.new(5, "")))
=> #<struct CBOR::Tag value=5, item="">
irb(main):004:0> CBOR.decode(CBOR.encode(CBOR::Tag.new(6, "")))
Traceback (most recent call last):
        7: from ~/.rubies/ruby-2.6.5/bin/irb:23:in `<main>'
        6: from ~/.rubies/ruby-2.6.5/bin/irb:23:in `load'
        5: from ~/.rubies/ruby-2.6.5/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
        4: from (irb):4
        3: from ~/.gem/ruby/2.6.5/gems/libcbor-0.1.0/lib/libcbor.rb:65:in `decode'
        2: from ~/.gem/ruby/2.6.5/gems/libcbor-0.1.0/lib/libcbor.rb:65:in `tap'
        1: from ~/.gem/ruby/2.6.5/gems/libcbor-0.1.0/lib/libcbor.rb:65:in `block in decode'
CBOR::DecodingError (CBOR::DecodingError)

Is DecodingError for byte \0x80 expected? 

$ irb
irb(main):002:0> require "libcbor/all"
.../.gem/ruby/2.6.0/gems/libcbor-0.1.0/lib/libcbor.rb:50: warning: constant ::Fixnum is deprecated
=> true
irb(main):004:0> CBOR.decode(CBOR.encode("\x7F".b))
=> "\x7F"
irb(main):005:0> CBOR.decode(CBOR.encode("\x80".b))
Traceback (most recent call last):
        7: from ../ruby-2.6.0/bin/irb:23:in `<main>'
        6: from ../ruby-2.6.0/bin/irb:23:in `load'
        5: from ../ruby-2.6.0/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
        4: from (irb):5
        3: from ../.gem/ruby/2.6.0/gems/libcbor-0.1.0/lib/libcbor.rb:65:in `decode'
        2: from ../.gem/ruby/2.6.0/gems/libcbor-0.1.0/lib/libcbor.rb:65:in `tap'
        1: from ../.gem/ruby/2.6.0/gems/libcbor-0.1.0/lib/libcbor.rb:65:in `block in decode'
CBOR::DecodingError (CBOR::DecodingError)

`CBOR.decode("A\x00")` returns empty string instead of `"\x00"`

Hi,

Is the following expected?

$ irb
irb(main):001:0> require "libcbor/all"
.gem/ruby/2.6.5/gems/libcbor-0.1.0/lib/libcbor.rb:50: warning: constant ::Fixnum is deprecated
=> true
irb(main):002:0> CBOR.decode("C\x01\x02\x03")
=> "\x01\x02\x03"
irb(main):003:0> CBOR.decode("C\x01\x00\x03")
=> "\x01"
irb(main):004:0> CBOR.decode("A\x00")
=> ""

I mean the last two decode return values.

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