refactor: use tuple for return type

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/frexp/docs/types/index.d.ts

@@ -62,7 +62,7 @@ interface Frexp {
 	* var out = frexp( -Infinity );
 	* // returns [ -Infinity , 0 ]
 	*/
-	( x: number ): Array<number>;
+	( x: number ): [ number, number ];
 
 	/**
 	* Splits a double-precision floating-point number into a normalized fraction and an integer power of two and assigns results to a provided output array.

lib/node_modules/@stdlib/math/base/special/frexp/docs/types/test.ts

@@ -25,7 +25,7 @@ import frexp = require( './index' );
 
 // The function returns an array of numbers...
 {
-	frexp( 4.0 ); // $ExpectType number[]
+	frexp( 4.0 ); // $ExpectType [number, number]
 }
 
 // The compiler throws an error if the function is provided an argument which is not a number...

lib/node_modules/@stdlib/math/base/special/frexpf/docs/types/index.d.ts

@@ -62,7 +62,7 @@ interface Frexpf {
 	* var out = frexpf( -Infinity );
 	* // returns [ -Infinity , 0 ]
 	*/
-	( x: number ): Array<number>;
+	( x: number ): [ number, number ];
 
 	/**
 	* Splits a single-precision floating-point number into a normalized fraction and an integer power of two and assigns results to a provided output array.

lib/node_modules/@stdlib/math/base/special/frexpf/docs/types/test.ts

@@ -25,7 +25,7 @@ import frexpf = require( './index' );
 
 // The function returns an array of numbers...
 {
-	frexpf( 4.0 ); // $ExpectType number[]
+	frexpf( 4.0 ); // $ExpectType [number, number]
 }
 
 // The compiler throws an error if the function is provided an argument which is not a number...

lib/node_modules/@stdlib/math/base/special/modf/docs/types/index.d.ts

@@ -36,7 +36,7 @@ interface Modf {
 	* var parts = modf( 3.14 );
 	* // returns [ 3.0, 0.14000000000000012 ]
 	*/
-	( x: number ): Array<number>;
+	( x: number ): [ number, number ];
 
 	/**
 	* Decomposes a double-precision floating-point number into integral and fractional parts, each having the same type and sign as the input value.

lib/node_modules/@stdlib/math/base/special/modf/docs/types/test.ts

@@ -25,7 +25,7 @@ import modf = require( './index' );
 
 // The function returns a numeric array...
 {
-	modf( 1.0 ); // $ExpectType number[]
+	modf( 1.0 ); // $ExpectType [number, number]
 }
 
 // The compiler throws an error if the function is provided an argument other than a number...