enh: update parser key generation condition for typecast

Add more robust check for generating key for parser caching for the field `tyepCast` to ensure value is used for only boolean input.
Also removed `test-typecast-dual-connections.test.cjs` as existing testcases are sufficient.

Author: MOHIT51196

lib/parsers/parser_cache.js

@@ -14,7 +14,7 @@ function keyFromFields(type, fields, options, config) {
     Boolean(options.rowsAsArray),
     Boolean(options.supportBigNumbers || config.supportBigNumbers),
     Boolean(options.bigNumberStrings || config.bigNumberStrings),
-    typeof options.typeCast === 'function' ? 'function' : options.typeCast,
+    typeof options.typeCast === 'boolean' ? options.typeCast : typeof options.typeCast,
     options.timezone || config.timezone,
     Boolean(options.decimalNumbers),
     options.dateStrings,