ALTER TABLE adds COLLATION to changes on numeric columns

[spaceemotion]

BC Break Report

Q	A
BC Break	yes
Version	2.10.0

Summary

The latest change in #3668 by @staudenmeir seem to have broken my migrations in MySQL that don't update text columns.

Previous behaviour

ALTER TABLE user_details 
CHANGE vat_amount vat_amount NUMERIC(8, 2) DEFAULT '0' NOT NULL, 
CHANGE vat_included vat_included TINYINT (1) DEFAULT '0' NOT NULL

Current behavior

ALTER TABLE user_details 
CHANGE vat_amount vat_amount NUMERIC(8, 2) DEFAULT '0' NOT NULL, 
CHANGE vat_included vat_included TINYINT (1) CHARACTER SET utf8mb4 DEFAULT '0' NOT NULL COLLATE `utf8mb4_unicode_ci`

How to reproduce

In a Laravel 6 project:

Schema::table('user_details', static function (Blueprint $table) {
    $table->decimal('vat_amount', 8, 2)->default(0)->change();
    $table->boolean('vat_included')->nullable(false)->default(false)->change();
});

[Ocramius]

duplicate of #3714

[spaceemotion]

Dang, I had this open half an hour ago, went to lunch and submitted when I came back haha.

[williamdes]

Haha submitted before lunch :p

[Ocramius]

s'alright - closing here meanwhile.

[github-actions]

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