diff --git a/sain/primitive/__init__.py b/sain/primitive/__init__.py
deleted file mode 100644
index 88f1dee..0000000
--- a/sain/primitive/__init__.py
+++ /dev/null
@@ -1,161 +0,0 @@
-from __future__ import annotations
-
-__all__ = (
-    "u8",
-    "u16",
-    "u32",
-    "u64",
-)
-
-import typing
-
-from sain import NOTHING
-from sain import Option
-from sain import Some
-
-if typing.TYPE_CHECKING:
-    from _typeshed import ConvertibleToInt
-    from typing_extensions import Self
-
-
-class _Primitive(int):
-    def __init__(
-        self,
-        *,
-        ctype: typing.Literal["u8", "u16", "u32", "u64", "u128"],
-        bits: int,
-        min: int,
-        max: int,
-    ):
-        if self < min or self > max:
-            raise OverflowError(
-                f"the literal `{self}` does not fit into the type `{ctype}` whose range is `{min}..{max}`"
-            )
-
-        self._ctype = ctype
-        self._bits = bits
-        self._min = min
-        self._max = max
-
-    def wrapping_add(self, value: Self) -> int:
-        if value >= self._max or value <= self._min:
-            return self
-
-        self += value
-        return self
-
-    def wrapping_sub(self, value: Self) -> int:
-        if value > self._max or value <= self._min:
-            self = self._max
-
-        self -= value
-        return self
-
-    @classmethod
-    def from_str(cls, value: str) -> Self:
-        return cls.__new__(cls, value)
-
-
-# fmt: off
-ASCII_CASE_MASK: typing.Final[int] = 0b0010_0000
-ASCII_LOWERCASE_TABLE = frozenset((
-    97, 98, 99, 100, 101,
-    102, 103, 104, 105, 106,
-    107, 108, 109, 110, 111,
-    112, 113, 114, 115, 116,
-    117, 118, 119, 120, 121,
-    122,
-))
-ASCII_UPPERCASE_TABLE = frozenset((
-    65, 66, 67, 68,
-    69, 70, 71, 72,
-    73, 74, 75, 76,
-    77, 78, 79, 80,
-    81, 82, 83, 84,
-    85, 86, 87, 88,
-    89, 90,
-))
-ASCII_DECIMAL_NUMBERS = frozenset((
-    48, 49, 50, 51,
-    52, 53, 54, 55,
-    56, 57,
-))
-ASCII_OCTA_NUMBERS = frozenset((
-    48, 49, 50, 51,
-    52, 53, 54, 55,
-))
-# fmt: on
-
-
-@typing.final
-class u8(_Primitive):
-    """The 8-bit unsigned integer type."""
-
-    def __init__(self, _: ConvertibleToInt = 0) -> None:
-        super().__init__(ctype="u8", bits=8, min=0, max=255)
-
-    def is_ascii(self) -> bool:
-        """Checks if the value is within the ASCII range.
-
-        Examples
-        --------
-        ```py
-        ascii = u8(97)
-        non_ascii = u8(150)
-
-        assert ascii.is_ascii()
-        assert not non_ascii.is_ascii()
-        ```
-        """
-        return self <= 127
-
-    def as_ascii(self) -> Option[bytes]:
-        # TYPE SAFETY: Returning NOTHING is the same as returning Some(None)
-        # but we avoid constructing a new Some(None) object.
-        return Some(self.to_bytes()) if self.is_ascii() else NOTHING  # pyright: ignore
-
-    def to_ascii_uppercase(self: int) -> u8:
-        return u8(self ^ ((self in ASCII_LOWERCASE_TABLE) * ASCII_CASE_MASK))
-
-    def to_ascii_lowercase(self: int) -> u8:
-        return u8(self | ((self in ASCII_UPPERCASE_TABLE) * ASCII_CASE_MASK))
-
-    def is_ascii_uppercase(self: int) -> bool:
-        return self in ASCII_UPPERCASE_TABLE
-
-    def is_ascii_lowercase(self: int) -> bool:
-        return self in ASCII_LOWERCASE_TABLE
-
-    def is_ascii_alphabetic(self: int) -> bool:
-        return self in ASCII_UPPERCASE_TABLE or self in ASCII_LOWERCASE_TABLE
-
-    def is_ascii_alphanumeric(self: int) -> bool:
-        return (
-            self in ASCII_DECIMAL_NUMBERS
-            or self in ASCII_LOWERCASE_TABLE
-            or self in ASCII_UPPERCASE_TABLE
-        )
-
-
-@typing.final
-class u16(_Primitive):
-    """The 16-bit unsigned integer type."""
-
-    def __init__(self, _: ConvertibleToInt = 0) -> None:
-        super().__init__(ctype="u16", bits=16, min=0, max=65535)
-
-
-@typing.final
-class u32(_Primitive):
-    """The 32-bit unsigned integer type."""
-
-    def __init__(self, _: ConvertibleToInt = 0) -> None:
-        super().__init__(ctype="u32", bits=8, min=0, max=4294967295)
-
-
-@typing.final
-class u64(_Primitive):
-    """The 64-bit unsigned integer type."""
-
-    def __init__(self, _: ConvertibleToInt = 0) -> None:
-        super().__init__(ctype="u64", bits=8, min=0, max=18446744073709551615)