Add __int__, __float__, and __bool__ to the array object (#127)

Author: asmeurer

spec/API_specification/array_object.md

@@ -274,7 +274,7 @@ Transpose of the array.
 Calculates the absolute value for each element `x_i` of an array instance `x` (i.e., the element-wise result has the same magnitude as the respective element in `x` but has positive sign).
 
 #### Special Cases
- 
+
 For floating-point operands,
 
 -   If `x_i` is `NaN`, the result is `NaN`.
@@ -377,6 +377,24 @@ Evaluates `x1_i & x2_i` for each element `x1_i` of an array instance `x1` with t
 Element-wise results must equal the results returned by the equivalent element-wise function [`bitwise_and(x1, x2)`](elementwise_functions.md#logical_andx1-x2-).
 ```
 
+(method-__bool__)=
+### \_\_bool\_\_(x, /)
+
+Converts a zero-dimensional boolean array to a Python `bool` object.
+
+#### Parameters
+
+-   **x**: _<array>_
+
+    -   zero-dimensional array instance. Must have a boolean data type.
+
+#### Returns
+
+-   **out**: _<bool>_
+
+    -   a Python `bool` object representing the single element of the array `x`.
+
+
 (method-__dlpack__)=
 ### \_\_dlpack\_\_(/, *, stream=None)
 
@@ -419,6 +437,7 @@ Exports the array as a DLPack capsule, for consumption by {ref}`function-from_dl
 
     -   A DLPack capsule for the array. See {ref}`data-interchange` for details.
 
+
 (method-__dlpack_device__)=
 ### \_\_dlpack\_device\_\_()
 
@@ -467,6 +486,23 @@ Computes the truth value of `x1_i == x2_i` for each element `x1_i` of an array i
 Element-wise results must equal the results returned by the equivalent element-wise function [`equal(x1, x2)`](elementwise_functions.md#equalx1-x2-).
 ```
 
+(method-__float__)=
+### \_\_float\_\_(x, /)
+
+Converts a zero-dimensional floating-point array to a Python `float` object.
+
+#### Parameters
+
+-   **x**: _<array>_
+
+    -   zero-dimensional array instance. Must have a floating-point data type.
+
+#### Returns
+
+-   **out**: _<float>_
+
+    -   a Python `float` object representing the single element of the array `x`.
+
 (method-__floordiv__)=
 ### \_\_floordiv\_\_(x1, x2, /)
 
@@ -550,6 +586,23 @@ Computes the truth value of `x1_i > x2_i` for each element `x1_i` of an array in
 Element-wise results must equal the results returned by the equivalent element-wise function [`greater(x1, x2)`](elementwise_functions.md#greaterx1-x2-).
 ```
 
+(method-__int__)=
+### \_\_int\_\_(x, /)
+
+Converts a zero-dimensional integer array to a Python `int` object.
+
+#### Parameters
+
+-   **x**: _<array>_
+
+    -   zero-dimensional array instance. Must have an integer data type.
+
+#### Returns
+
+-   **out**: _<int>_
+
+    -   a Python `int` object representing the single element of the array `x`.
+
 (method-__invert__)=
 ### \_\_invert\_\_(x, /)