Utility types needed if you want to implement Format on your own type.
| DecimalStr | Simple wrapper type for a &str to make sure its length is less than the maximum for
a decimal (8 bytes).
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| InfinityStr | Simple wrapper type for a &str to make sure its length is less than the maximum for
an infinity symbol (128 bytes).
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| MinusSignStr | Simple wrapper type for a &str to make sure its length is less than the maximum for
a minus sign (8 bytes).
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| NanStr | Simple wrapper type for a &str to make sure its length is less than the maximum for
a nan symbol (64 bytes).
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| PlusSignStr | Simple wrapper type for a &str to make sure its length is less than the maximum for
a plus sign (8 bytes).
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| SeparatorStr | Simple wrapper type for a &str to make sure its length is less than the maximum for
a separator (8 bytes).
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