Operator for `$isSubset`

methods. See Set`$isSubset`

for full details.
Operators can be used for:

Name | Description | Operator |

Subset | `x` is a subset of `y` | `x <= y` |

Proper Subset | `x` is a proper subset of `y` | `x < y` |

Superset | `x` is a superset of `y` | `x >= y` |

Proper Superset | `x` is a proper superset of `y` | `x > y` |

# S3 method for Set <(x, y) # S3 method for Set <=(x, y) # S3 method for Set >(x, y) # S3 method for Set >=(x, y)

x, y |
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