Connector.prototype.isRelational returns a function

[achrinza]

Steps to reproduce

Call new Connector(/*...*/).isRelational()

Offending line:

loopback-connector/lib/connector.js

Lines 36 to 37 in e857973

	return this.isRelational ||
	(this.getTypes().indexOf('rdbms') !== -1);

Current Behavior

It returns itself (a function), which then requires a 2nd call to get the expected boolean value.

Expected Behavior

Connector.prototype.isRelational should strictly return a boolean.

Link to reproduction sandbox

N/A

Additional information

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