pub fn isdigit<D: Dimension>(a: &StringArray<D>) -> FerrayResult<Array<bool, D>>Expand description
Return true where every character is a digit and the string is
non-empty. Matches numpy.strings.isdigit, which delegates per
element to CPython’s str.isdigit() (Py_UNICODE_ISDIGIT):
Unicode Numeric_Type of Decimal or Digit. This is broader than
isdecimal (it accepts superscripts/subscripts like ²³, circled
digits like ①, and parenthesized digits) and narrower than
isnumeric (it rejects fractions like ½ and letter-numerals like
Ⅻ). See [is_digit_char]/[DIGIT_RANGES].