refactor: tighten types

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
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    status: passed
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---

Author: kgryte

lib/node_modules/@stdlib/array/base/symmetric-banded/filled2d-by/docs/types/index.d.ts

@@ -31,7 +31,7 @@ type Nullary<T, V> = ( this: V ) => T;
 * @param indices - current array element indices
 * @returns fill value
 */
-type Unary<T, V> = ( this: V, indices: Array<number> ) => T;
+type Unary<T, V> = ( this: V, indices: [ number, number ] ) => T;
 
 /**
 * Callback function.