Its a quite necessary feature which is needed for working with too large
hashes, when you need to clear some data from specified fields which are
located on different nesting levels, e.g. personal data. Its provides
removing key-value pair in any level nesting of hash pair.
Example:
{ k: 1, v: { l: { t: 2 } } }.deep_delete(:t)
# => {:k=>1, :v=>{:l=>{}}
I have code for this feature and want to commit this.
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