[fp.style] - C++20 → C++23

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-### Floating-point type properties <a id="fp.style">[[fp.style]]</a>
-#### Type `float_round_style` <a id="round.style">[[round.style]]</a>
-``` cpp
-namespace std {
-  enum float_round_style {
-    round_indeterminate       = -1,
-    round_toward_zero         =  0,
-    round_to_nearest          =  1,
-    round_toward_infinity     =  2,
-    round_toward_neg_infinity =  3
-  };
-}
-```
-The rounding mode for floating-point arithmetic is characterized by the
-values:
-- `round_indeterminate` if the rounding style is indeterminable
-- `round_toward_zero` if the rounding style is toward zero
-- `round_to_nearest` if the rounding style is to the nearest
-  representable value
-- `round_toward_infinity` if the rounding style is toward infinity
-- `round_toward_neg_infinity` if the rounding style is toward negative
-  infinity
-#### Type `float_denorm_style` <a id="denorm.style">[[denorm.style]]</a>
-``` cpp
-namespace std {
-  enum float_denorm_style {
-    denorm_indeterminate = -1,
-    denorm_absent = 0,
-    denorm_present = 1
-  };
-}
-```
-The presence or absence of subnormal numbers (variable number of
-exponent bits) is characterized by the values:
-- `denorm_indeterminate` if it cannot be determined whether or not the
-  type allows subnormal values
-- `denorm_absent` if the type does not allow subnormal values
-- `denorm_present` if the type does allow subnormal values

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