[LANG-992] NumberUtils#isNumber() returns false for "0.0", "0.4790", et al - ASF JIRA

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After upgrading from 3.1 to 3.3.1, it seems that isNumber(String str) returns false for decimal numbers with leading zeros. In other words:

boolean ret = NumberUtils.isNumber("0.4790");

On 3.1, ret was true. In 3.3.1, ret is false.

Guessing that ~~LANG-972~~ is related... comment in the code states:

// leading 0, but not hex, must be octal

This is clearly a case where leading 0 means neither hex nor octal.

is broken by

LANG-971 NumberUtils#isNumber(String) fails to reject invalid Octal numbers

is related to

LANG-997 NumberUtil#isNumber() returns false for "012345678" but not for "12345678"

LANG-1252 NumberUtils.isNumber and NumberUtils.createNumber resolve inconsistently

relates to

LANG-1040 Javadoc for NumberUtils.isNumber() are not clear enough

LANG-1252 NumberUtils.isNumber and NumberUtils.createNumber resolve inconsistently