fix: treat generic accessor arrays similar to built-in generic arrays

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/array/lib/main.js

@@ -165,7 +165,7 @@ function array() {
 			btype = getDType( buffer );
 			FLG = true;
 		} else {
-			btype = getBufferDType( buffer );
+			btype = getBufferDType( buffer ) || 'generic'; // fallback to a "generic" dtype when provided, e.g., a generic accessor array as a data source
 			FLG = false;
 		}
 	}
@@ -208,7 +208,7 @@ function array() {
 		if ( btype && !isAllowedCast( btype, dtype, opts.casting ) ) {
 			throw new Error( format( 'invalid option. Data type cast is not allowed. Casting mode: `%s`. From: `%s`. To: `%s`.', opts.casting, btype, dtype ) );
 		}
-	} else if ( btype ) {
+	} else if ( btype ) { // btype !== void 0
 		// TODO: reconcile difference in behavior when provided a generic array and no `dtype` option. Currently, we cast here, but do not allow casting a generic array (by default) when explicitly providing a `dtype` option.
 
 		// Only cast generic array data sources when not provided an ndarray...
@@ -320,7 +320,7 @@ function array() {
 			}
 		}
 	} else if ( buffer ) {
-		if ( btype === 'generic' && opts.flatten ) {
+		if ( btype === 'generic' && opts.flatten && isArray( buffer ) ) {
 			buffer = flatten( buffer, osh || arrayShape( buffer ), order === 'column-major' );
 		}
 		if ( buffer.length !== len ) {