Methodes from the FromPrimitive trait, exposed as free functions.
| from_f32 | Converts an f32 to return an optional value of this type.
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| from_f64 | Converts an f64 to return an optional value of this type.
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| from_i8 | Converts an i8 to return an optional value of this type.
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| from_i16 | Converts an i16 to return an optional value of this type.
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| from_i32 | Converts an i32 to return an optional value of this type.
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| from_i64 | Converts an i64 to return an optional value of this type.
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| from_isize | Converts an isize to return an optional value of this type.
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| from_u8 | Converts an u8 to return an optional value of this type.
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| from_u16 | Converts an u16 to return an optional value of this type.
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| from_u32 | Converts an u32 to return an optional value of this type.
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| from_u64 | Converts an u64 to return an optional value of this type.
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| from_usize | Converts an usize to return an optional value of this type.
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