Support for optional parameters about ts-cacheable

[angelnikolov]

@geraparra So, the way we figure out what the cacheKey is (the thing which we use to search for cache) is by using a hasher function, which takes your parameters and creates the key on every call, based on the parameters.
The default one is this

export const DEFAULT_HASHER = (parameters: Array<any>) => parameters.map(param => param !== undefined ? JSON.parse(JSON.stringify(param)) : param);

As you can see, we are checking for undefined there. So I suggest you just add your own hasher which doesnt do that by either providing the cacheHasher property to your decorator https://github.com/angelnikolov/ts-cacheable#configuration, or adding that to the GlobalCacheConfig
GlobalCacheConfig

[stale]

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