JRuby

Hash.inspect in --1.9 results in ASCII-8BIT encoding

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Description

In MRI 1.9,

{'a' => 1}.inspect.encoding is UTF8. In JRuby --1.9, {'a' => 1}

.inspect.encoding is ASCII-8BIT.

Heuristically, if a hash contains string keys or a multibyte (not necessarily UTF8) string value, then MRI encodes in UTF8:

{1 => 'áßçîî'}

.inspect.encoding #=> UTF8

{'ascii' => 1}

.inspect.encoding #=> UTF8

{1 => non_utf8_multibyte_encoding}

.inspect.encoding #=> UTF8

If the hash contains no strings in the keys and no multibyte strings in values, then MRI also encodes in ASCII-8BIT:
{}.inspect.encoding #=> ASCII-8BIT

{1 => 2}

.inspect.encoding #=> ASCII-8BIT

{1 => 'ascii'}

.inspect.encoding #=> ASCII-8BIT

JRuby always encodes in ASCII-8BIT no matter what.

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Hiro Asari added a comment -

I can't tell when this was fixed, but 1.6.5 behaves correctly.

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Hiro Asari added a comment - I can't tell when this was fixed, but 1.6.5 behaves correctly.

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  • Assignee:
    Hiro Asari
    Reporter:
    David Lee
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