Encoding Defaulting to ASCII-8BIT

Question

I have the following file:

# encoding: UTF-8

a = 1 << 7

puts a.chr.encoding

This gives me back

ASCII-8BIT

. Why doesn't this give back

UTF-8

and I would expect?

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Answer 1

chr has a encoding parameter, defaulting to ASCII, when char is < 0xff (there UTF is identical to ASCII):

128.chr.encoding                  # => #<Encoding:ASCII-8BIT>
255.chr.encoding                  # => #<Encoding:ASCII-8BIT>
256.chr.encoding                  # => RangeError: 256 out of char range
Encoding.default_internal = Encoding::UTF_8
255.chr.encoding                  # => #<Encoding:ASCII-8BIT>
256.chr.encoding                  # => #<Encoding:UTF-8>

128.chr(Encoding::UTF_8).encoding # => #<Encoding:UTF-8>
500.chr(Encoding::UTF_8).encoding # => #<Encoding:UTF-8>

Encoding Defaulting to ASCII-8BIT

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