| Ensure that x is array, and raise AssertError if it is not.
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| Ensure that x is boolean, and raise AssertError if it is not.
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| Ensure that x is function, and raise AssertError if it is not.
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| Ensure that x follows the type of ref, and raise AssertError if it is not.
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| Ensure that x is null, and raise AssertError if it is not.
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| Ensure that x is null or undefined, and raise AssertError if it is not.
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| Ensure that x is number, and raise AssertError if it is not.
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| Ensure that x is object, and raise AssertError if it is not.
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| Ensure that x is string, and raise AssertError if it is not.
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| Ensure that x is undefined, and raise AssertError if it is not.
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| Return x as-is if x is array or raise an EnsureError when it's not.
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| Return x as-is if x is boolean or raise an EnsureError when it's not.
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| Return x as-is if x is function or raise an EnsureError when it's not.
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| Return x as-is if x follows the reference or raise an EnsureError when it doesn't.
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| Return x as-is if x is null or raise an EnsureError when it's not.
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| Return x as-is if x is null or undefined or raise an EnsureError when it's not.
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| Return x as-is if x is number or raise an EnsureError when it's not.
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| Return x as-is if x is object or raise an EnsureError when it's not.
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| Return x as-is if x is string or raise an EnsureError when it's not.
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| Return x as-is if x is undefined or raise an EnsureError when it's not.
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| Return true if the type of x is array.
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| Return true if the type of x is boolean.
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| Return true if the type of x is function.
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| Return true if the type of x follows the type of ref.
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| Return true if the type of x is null.
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| Return true if the type of x is null or undefined.
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| Return true if the type of x is number.
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| Return true if the type of x is object.
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| Return true if the type of x is string.
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| Return true if the type of x is undefined.
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| Return x as-is if the type of the value is array or undefined if not.
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| Return x as-is if the type of the value is boolean or undefined if not.
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| Return x as-is if the type of the value is function or undefined if not.
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| Return x as-is if the type of the value follow the reference or undefined if not.
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| Return x as-is if the type of the value is number or undefined if not.
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| Return x as-is if the type of the value is object or undefined if not.
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| Return x as-is if the type of the value is string or undefined if not.
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