`finfo`/`iinfo` accepts strings?

[mdhaber]

According to the standard, the only acceptable types for the argument of finfo are dtype and array. However, finfo and iinfo currently accept strings.

import array_api_strict as xp
xp.finfo('float32')
# finfo_object(bits=32, eps=1.1920928955078125e-07, max=3.4028234663852886e+38, min=-3.4028234663852886e+38, smallest_normal=1.1754943508222875e-38, dtype=dtype('float32'))
# iinfo_object(bits=32, max=2147483647, min=-2147483648, dtype=dtype('int32'))

I'm not sure what the definition of the dtype type is, so this might be OK, but I'm guessing it's more flexible than intended.

[ev-br]

cross-ref gh-116