Flowtype：函数集合（抛出错误）vs条件（不抛出）

Question

我在尝试修改一些代码时遇到了一些麻烦，而且我不知道我做错了什么或者它是一个错误。

此代码抛出错误： https://flow.org/try/#0C4TwDgpgBAQgNgewMYGs4gMIENgQOYIBOIUAvFAN4A+AUFFAEaKoDOAXFAIKGFYgA88ZGhAwsLCAFE4EALYQAdsAB8AGjpQAJhABmASwUQOAciQ58REMfX0FWeRxbBCBvDahIEiAK6EA-BwK3rIMEITuEAAeYFgK2poBjAheELHqVAC+ANw0ngpOHuYExADiimE4RGRQABQQMvJKHEKo6Ni4xSCqUHqakYHBoYQAlGTKtRr8Zh2WUCgQIKQUvZEZUHbyS-VyisAAdBsQa54+hFsNu3snCL5rUTFxEJrnO0p797HxawD0yjTDORooEgsGYIhaKGq1A02n0hhMTGE1g0wKMUCcLgUbhhehYWCYT0SDGSMjSNEyOTyBURqDKhl4wCq5DqFyaoOE6Ah3RWAxCYVGpHGNUmNMh80Wyz6a1RL0a+1Ra00uPxMmeFG2cr2SrxBM0Pz+AKB4GgEPQAGUIGAobR6LCDGjjBIwMj6HgsGBEkE+eFydlcgh8sB0Za6RVGYRqizXsBmmDzZbuX1eUMBULJk65gslis1m6wLLLnn9f9Aaj2a1ROIpKyg+RTaIwVAqOWRBawDky-WACok4mRaTR6r19oWYhNlucqsDuWAqlB0XoUMMogsKEaUUcUVLyo++jTUcgDg6MZQHTuJ2OEPlZc+v00ADaFBhuntCLBLqgqJMAFkEAA3CAADEiAAdywQhNGRDJuifW0X3hKBjFFD8v0Q38ALEVAwIgqCYOfOEHWQ9xUOMdCIAAJT0PAAAtgFwyh8NfRCiJRY0f3-CAABldDo9QMgAXT2WR3RqKM5VjDkQB7Lw+2nXZE0iVMGL3AMCjwa8d2qBcQG3cMWHvDVLjtQx+MBeg9GPGpUQQY91PpTSAEJSHIYwdG8BQkGAPQA2MUZYPoT9qMIBAQPWCBQskHgiBqAADLtqOgQylC0eC9C8gNEIAEnVGstXgo5jC0BAIFXBQECDKJcWAGLDXoDIaA0QgIGAXwFCgOyw2ipLgAUw0MgBIA

虽然这不是：https://flow.org/try/#0C4TwDgpgBAQgNgewMYGs4gMIENgQOYIBOIUAvFAN4A+AUFFAEaKoDOAXFAIKGFYgA88ZGhAwsLCAFE4EALYQAdsAB8AGjpQAJhABmASwUQOAciQ58REMfX0FWeRxbBCBvDahIEiAK6EA-BwK3rIMEITuEAAeYFgK2poBjAheELHqVAC+ANw0ngpOHuYExADiimE4RGRQABQQMvJKHEKo6Ni4xSCqUHqakYHBoYQAlGTKtRr8Zh2WUCgQIKQUvZEZUHbyS-VyisAAdBsQa54+hFsNu3snCL5rUTFxEJrnO0p797HxawD0yjTDORooEgsGYIhaKGq1A02n0hhMTGE1g0wKMUCcLgUbhhehYWCYT0SDGSMjSNEyOTyBURqDKhl4wCq5DqFyaoOE6Ah3RWAxCYVGpHGNUmNMh80Wyz6a1RL0a+1Ra00uPxMmeFG2cr2SrxBM0Pz+AKB4GgEPQAGUIGAobR6LCDGjjBIwMj6HgsGBEkE+eFydlcgh8sB0Za6RVGYRqizXsBmmDzZbuX1eUMBULJk65gslis1m6wLLLnn9f9Aaj2a1ROIpKyg+RTaIwVAqOWRBawDky-WACok4mRaTR6r19oWYhNlucqsDuWAmg0ADaFA0tt09oRYJd9CgqJMAFkEAA3CAAMSIAHcsIRNJuMt0l1utKv4VBjKLN-Qdy-90exKgL1ebzvZdHzhB033cD9jT3Q8IAAJT0PAAAtgEAyhgLtZ9Xw3CDtygr8YIAGV0FD3AyABdPZZHdGoozlWMORAHsvD7addkTSJUzQ+g9B0WoNUuDDoFIYSXzfUZ7y3QgIGAXwFEYMFQwZIhaLYno+kNegMg0Hi+JrLUnyEkTHUtYxxOAp1FMqQgVKUdiNKgLTuN4mz9kEsgjOmUcrDMh9PM6Szwxcuyck0jQUUQwgEDPdYIGiyQeGUgADLtEOgfilBAgw9GAPQAxfAASdU9MEjJjC0BAIBYdYECDKJcWARLDQyAEgA

顺便说一下，最后一个数组是一样的。

谢谢。