[Future]: Remove type casting

[todo]

LDfields/packages/fields/react/generic/basic-input/src/index.tsx

Lines 27 to 32 in e517e19

	// TODO [Future]: Remove type casting
	onChange({ [this.modifier]: value } as { [key in keyof Props & string]?: string });
	}}
	/>
	</>
	);

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This issue was generated by todo based on a TODO comment in e517e19. It's been assigned to @jeswr because they committed the code.