Description:
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I am trying to use the Number formatter to get information but the get text attribute is returning strange results.

Test script:
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setlocale(LC_ALL,'en_GB');
Locale::setDefault('en_GB');
$formatter = new NumberFormatter($locale, NumberFormatter::CURRENCY);

// This should be currency symbol but result is null
$result = $formatter->getTextAttribute(NumberFormatter::CURRENCY_SYMBOL);

// This should be decimal sperator, but its the currency symbol
$result = $formatter->getTextAttribute(NumberFormatter::DECIMAL_SEPARATOR_SYMBOL)

Expected result:
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// This should be currency symbol but result is null
echo $formatter->getTextAttribute(NumberFormatter::CURRENCY_SYMBOL); // £

// This should be decimal sperator, but its the currency symbol
echo $formatter->getTextAttribute(NumberFormatter::DECIMAL_SEPARATOR_SYMBOL); // .

Actual result:
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// This should be currency symbol but result is null
echo $formatter->getTextAttribute(NumberFormatter::CURRENCY_SYMBOL); // NULL

// This should be decimal sperator, but its the currency symbol
echo $formatter->getTextAttribute(NumberFormatter::DECIMAL_SEPARATOR_SYMBOL); // £