Unable to interpret raw 4-byte ieee754 floating point TRE values

[bndkr]

The BANDSB TRE includes 4-byte fields that use the ieee754 floating-point format:

sarpy/sarpy/io/general/nitf_elements/tres/unclass/BANDSB.py

Line 35 in dad0ba7

self.add_field('SCALE_FACTOR', 'ieee754_binary32', 4, value)

When interpreted, these values are converted to floating-point numbers. However, when we want to convert a TRE to a dict, there is no support to place floating-point numbers in the dict:

sarpy/sarpy/io/general/nitf_elements/tres/tre_elements.py

Lines 165 to 183 in dad0ba7

	def to_dict(self):
	"""
	Create a dictionary representation of the object.
	Returns
	-------
	dict
	"""
	out = OrderedDict()
	for fld in self._field_ordering:
	val = getattr(self, fld)
	if val is None or isinstance(val, (bytes, str, int)):
	out[fld] = val
	elif isinstance(val, TREElement):
	out[fld] = val.to_dict()
	else:
	raise TypeError('Unhandled type {}'.format(type(val)))
	return out

The error check should be updated:

-        if val is None or isinstance(val, (bytes, str, int)):
+        if val is None or isinstance(val, (bytes, str, int, float)):